4.14.41-stable review

This is the start of the stable review cycle for the 4.14.41 release. There are 62 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know.

Responses should be made by Wed May 16 06:47:52 UTC 2018. Anything received after that time might be too late.

The whole patch series can be found in one patch at:

	https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.14.41-rc1.gz

or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y
and the diffstat can be found below.

thanks,

greg k-h

-------------
Pseudo-Shortlog of commits:

Greg Kroah-Hartman <[email protected]>

    Linux 4.14.41-rc1

Anthoine Bourgeois <[email protected]>
KVM: x86: remove APIC Timer periodic/oneshot spikes

Paul Mackerras <[email protected]>
KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault handler

Peter Zijlstra <[email protected]>
perf/x86: Fix possible Spectre-v1 indexing for x86_pmu::event_map()

Peter Zijlstra <[email protected]>

    perf/core: Fix possible Spectre-v1 indexing for ->aux_pages[]

Peter Zijlstra <[email protected]>
perf/x86/msr: Fix possible Spectre-v1 indexing in the MSR driver

Peter Zijlstra <[email protected]>
perf/x86/cstate: Fix possible Spectre-v1 indexing for pkg_msr

Peter Zijlstra <[email protected]>
perf/x86: Fix possible Spectre-v1 indexing for hw_perf_event cache_*

Masami Hiramatsu <[email protected]>
tracing/uprobe_event: Fix strncpy corner case

Peter Zijlstra <[email protected]>

    sched/autogroup: Fix possible Spectre-v1 indexing for sched_prio_to_weight[]

Steve French <[email protected]>
smb3: directory sync should not return an error

Jens Axboe <[email protected]>
nvme: add quirk to force medium priority for SQ creation

Marek Szyprowski <[email protected]>
thermal: exynos: Propagate error value from tmu_read()

Marek Szyprowski <[email protected]>
thermal: exynos: Reading temperature makes sense only when TMU is turned on

Hans de Goede <[email protected]>
Bluetooth: btusb: Only check needs_reset_resume DMI table for QCA rome chipsets

Hans de Goede <[email protected]>
Bluetooth: btusb: Add Dell XPS 13 9360 to btusb_needs_reset_resume_table

Hans de Goede <[email protected]>
Revert "Bluetooth: btusb: Fix quirk for Atheros 1525/QCA6174"

Rafael J. Wysocki <[email protected]>
cpufreq: schedutil: Avoid using invalid next_freq

Rafael J. Wysocki <[email protected]>
PCI / PM: Check device_may_wakeup() in pci_enable_wake()

Kai Heng Feng <[email protected]>
PCI / PM: Always check PME wakeup capability for runtime wakeup support

Gustavo A. R. Silva <[email protected]>
atm: zatm: Fix potential Spectre v1

Gustavo A. R. Silva <[email protected]>
net: atm: Fix potential Spectre v1

Ville Syrjälä <[email protected]>
drm/atomic: Clean private obj old_state/new_state in drm_atomic_state_default_clear()

Ville Syrjälä <[email protected]>
drm/atomic: Clean old_state/new_state in drm_atomic_state_default_clear()

Lyude Paul <[email protected]>
drm/nouveau: Fix deadlock in nv50_mstm_register_connector()

Florent Flament <[email protected]>
drm/i915: Fix drm:intel_enable_lvds ERROR message in kernel log

Boris Brezillon <[email protected]>
drm/vc4: Fix scaling of uni-planar formats

Lukas Wunner <[email protected]>
can: hi311x: Work around TX complete interrupt erratum

Lukas Wunner <[email protected]>

    can: hi311x: Acquire SPI lock on ->do_get_berr_counter

Jimmy Assarsson <[email protected]>
can: kvaser_usb: Increase correct stats counter in kvaser_usb_rx_can_msg()

Ilya Dryomov <[email protected]>
ceph: fix rsize/wsize capping in ceph_direct_read_write()

David Rientjes <[email protected]>
mm, oom: fix concurrent munlock and oom reaper unmap, v3

Pavel Tatashin <[email protected]>
mm: sections are not offlined during memory hotremove

Vitaly Wool <[email protected]>
z3fold: fix reclaim lock-ups

Steven Rostedt (VMware) <[email protected]>
tracing: Fix regex_match_front() to not over compare the test string

Mikulas Patocka <[email protected]>
dm integrity: use kvfree for kvmalloc'd memory

Hans de Goede <[email protected]>
libata: Apply NOLPM quirk for SanDisk SD7UB3Q*G1001 SSDs

Johan Hovold <[email protected]>
rfkill: gpio: fix memory leak in probe error path

Uwe Kleine-König <[email protected]>
gpio: fix error path in lineevent_create

Govert Overgaauw <[email protected]>
gpio: fix aspeed_gpio unmask irq

Timur Tabi <[email protected]>
gpioib: do not free unrequested descriptors

Jann Horn <[email protected]>
compat: fix 4-byte infoleak via uninitialized struct field

Suzuki K Poulose <[email protected]>
arm64: Add work around for Arm Cortex-A55 Erratum 1024718

Paul Mackerras <[email protected]>
KVM: PPC: Book3S HV: Fix VRMA initialization with 2MB or 1GB memory backing

Laurent Vivier <[email protected]>
KVM: PPC: Book3S HV: Fix guest time accounting with VIRT_CPU_ACCOUNTING_GEN

Paul Mackerras <[email protected]>
KVM: PPC: Book3S HV: Fix trap number return from __kvmppc_vcore_entry

Jan Kara <[email protected]>
bdi: Fix oops in wb_workfn()

Tetsuo Handa <[email protected]>
bdi: wake up concurrent wb_shutdown() callers.

Eric Dumazet <[email protected]>
tcp: fix TCP_REPAIR_QUEUE bound checking

Jiri Olsa <[email protected]>
perf: Remove superfluous allocation error check

Michal Hocko <[email protected]>
memcg: fix per_node_info cleanup

Eric Dumazet <[email protected]>
inetpeer: fix uninit-value in inet_getpeer

Eric Dumazet <[email protected]>
soreuseport: initialise timewait reuseport field

Eric Dumazet <[email protected]>
ipv4: fix uninit-value in ip_route_output_key_hash_rcu()

Eric Dumazet <[email protected]>

    dccp: initialize ireq->ir_mark

Eric Dumazet <[email protected]>
net: fix uninit-value in __hw_addr_add_ex()

Eric Dumazet <[email protected]>

    net: initialize skb->peeked when cloning

Eric Dumazet <[email protected]>
net: fix rtnh_ok()

Eric Dumazet <[email protected]>
netlink: fix uninit-value in netlink_sendmsg

Eric Dumazet <[email protected]>
crypto: af_alg - fix possible uninit-value in alg_bind()

Tom Herbert <[email protected]>
kcm: Call strp_stop before strp_done in kcm_attach

Florian Westphal <[email protected]>
netfilter: ebtables: don't attempt to allocate 0-sized compat array

Julian Anastasov <[email protected]>
ipvs: fix rtnl_lock lockups caused by start_sync_thread

-------------

Diffstat:

 Documentation/arm64/silicon-errata.txt  |   1 +
 Makefile                                |   4 +-
 arch/arm64/Kconfig                      |  14 +++
 arch/arm64/include/asm/assembler.h      |  40 +++++++++
 arch/arm64/include/asm/cputype.h        |   2 +
 arch/arm64/mm/proc.S                    |   5 ++
 arch/powerpc/kvm/book3s_64_mmu_radix.c  |  72 +++++++++------
 arch/powerpc/kvm/book3s_hv.c            |  17 ++--
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |   8 +-
 arch/x86/events/core.c                  |   8 +-
 arch/x86/events/intel/cstate.c          |   2 +
 arch/x86/events/msr.c                   |   9 +-
 arch/x86/kvm/lapic.c                    |  37 ++++----
 crypto/af_alg.c                         |   8 +-
 drivers/ata/libata-core.c               |   3 +
 drivers/atm/zatm.c                      |   3 +
 drivers/bluetooth/btusb.c               |  19 +++-
 drivers/gpio/gpio-aspeed.c              |   2 +-
 drivers/gpio/gpiolib.c                  |   7 +-
 drivers/gpu/drm/drm_atomic.c            |   8 ++
 drivers/gpu/drm/i915/intel_lvds.c       |   3 +-
 drivers/gpu/drm/nouveau/nv50_display.c  |   7 +-
 drivers/gpu/drm/vc4/vc4_plane.c         |   2 +-
 drivers/md/dm-integrity.c               |   2 +-
 drivers/net/can/spi/hi311x.c            |  11 ++-
 drivers/net/can/usb/kvaser_usb.c        |   2 +-
 drivers/nvme/host/nvme.h                |   5 ++
 drivers/nvme/host/pci.c                 |  12 ++-
 drivers/pci/pci.c                       |  37 +++++---
 drivers/thermal/samsung/exynos_tmu.c    |  14 ++-
 fs/ceph/file.c                          |  10 +--
 fs/cifs/cifsfs.c                        |  13 +++
 fs/fs-writeback.c                       |   2 +-
 include/linux/oom.h                     |   2 +
 include/linux/wait_bit.h                |  17 ++++
 include/net/inet_timewait_sock.h        |   1 +
 include/net/nexthop.h                   |   2 +-
 kernel/compat.c                         |   1 +
 kernel/events/callchain.c               |  10 +--
 kernel/events/ring_buffer.c             |   7 +-
 kernel/sched/autogroup.c                |   7 +-
 kernel/sched/cpufreq_schedutil.c        |   3 +-
 kernel/trace/trace_events_filter.c      |   3 +
 kernel/trace/trace_uprobe.c             |   2 +
 mm/backing-dev.c                        |   2 +-
 mm/memcontrol.c                         |   3 +
 mm/mmap.c                               |  44 +++++----
 mm/oom_kill.c                           |  74 ++++++++-------
 mm/sparse.c                             |   2 +-
 mm/z3fold.c                             |  42 ++++++---
 net/atm/lec.c                           |   9 +-
 net/bridge/netfilter/ebtables.c         |  11 +--
 net/core/dev_addr_lists.c               |   4 +-
 net/core/skbuff.c                       |   1 +
 net/dccp/ipv4.c                         |   1 +
 net/dccp/ipv6.c                         |   1 +
 net/ipv4/inet_timewait_sock.c           |   1 +
 net/ipv4/inetpeer.c                     |   1 +
 net/ipv4/route.c                        |  11 +--
 net/ipv4/tcp.c                          |   2 +-
 net/kcm/kcmsock.c                       |   1 +
 net/netfilter/ipvs/ip_vs_ctl.c          |   8 --
 net/netfilter/ipvs/ip_vs_sync.c         | 155 ++++++++++++++++----------------
 net/netlink/af_netlink.c                |   2 +
 net/rfkill/rfkill-gpio.c                |   7 +-
 65 files changed, 543 insertions(+), 283 deletions(-)

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Julian Anastasov <[email protected]>

commit 5c64576a77894a50be80be0024bed27171b55989 upstream.

syzkaller reports for wrong rtnl_lock usage in sync code [1] and [2]

We have 2 problems in start_sync_thread if error path is taken, eg. on memory allocation error or failure to configure sockets for mcast group or addr/port binding:

1. recursive locking: holding rtnl_lock while calling sock_release which in turn calls again rtnl_lock in ip_mc_drop_socket to leave the mcast group, as noticed by Florian Westphal. Additionally, sock_release can not be called while holding sync_mutex (ABBA deadlock).

2. task hung: holding rtnl_lock while calling kthread_stop to stop the running kthreads. As the kthreads do the same to leave the mcast group (sock_release -> ip_mc_drop_socket -> rtnl_lock) they hang.

Fix the problems by calling rtnl_unlock early in the error path, now sock_release is called after unlocking both mutexes.

Problem 3 (task hung reported by syzkaller [2]) is variant of problem 2: use _trylock to prevent one user to call rtnl_lock and then while waiting for sync_mutex to block kthreads that execute sock_release when they are stopped by stop_sync_thread.

[1]
IPVS: stopping backup sync thread 4500 ...
WARNING: possible recursive locking detected 4.16.0-rc7+ #3 Not tainted
--------------------------------------------
syzkaller688027/4497 is trying to acquire lock:
(rtnl_mutex){+.+.}, at: [<00000000bb14d7fb>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74

but task is already holding lock:
IPVS: stopping backup sync thread 4495 ...
(rtnl_mutex){+.+.}, at: [<00000000bb14d7fb>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74

other info that might help us debug this:

  Possible unsafe locking scenario:

        CPU0
        ----

lock(rtnl_mutex);
lock(rtnl_mutex);

*** DEADLOCK ***

May be due to missing lock nesting notation

2 locks held by syzkaller688027/4497:
#0: (rtnl_mutex){+.+.}, at: [<00000000bb14d7fb>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74
#1: (ipvs->sync_mutex){+.+.}, at: [<00000000703f78e3>]

do_ip_vs_set_ctl+0x10f8/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2388

stack backtrace:
CPU: 1 PID: 4497 Comm: syzkaller688027 Not tainted 4.16.0-rc7+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x24d lib/dump_stack.c:53
  print_deadlock_bug kernel/locking/lockdep.c:1761 [inline]
  check_deadlock kernel/locking/lockdep.c:1805 [inline]
  validate_chain kernel/locking/lockdep.c:2401 [inline]
  __lock_acquire+0xe8f/0x3e00 kernel/locking/lockdep.c:3431
  lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
  __mutex_lock_common kernel/locking/mutex.c:756 [inline]
  __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
  mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
  rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
  ip_mc_drop_socket+0x88/0x230 net/ipv4/igmp.c:2643
  inet_release+0x4e/0x1c0 net/ipv4/af_inet.c:413
  sock_release+0x8d/0x1e0 net/socket.c:595
  start_sync_thread+0x2213/0x2b70 net/netfilter/ipvs/ip_vs_sync.c:1924
  do_ip_vs_set_ctl+0x1139/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2389
  nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
  nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
  ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1261
  udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2406
  sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
  SYSC_setsockopt net/socket.c:1849 [inline]
  SyS_setsockopt+0x189/0x360 net/socket.c:1828
  do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x446a69
RSP: 002b:00007fa1c3a64da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446a69
RDX: 000000000000048b RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006e29fc R08: 0000000000000018 R09: 0000000000000000
R10: 00000000200000c0 R11: 0000000000000246 R12: 00000000006e29f8
R13: 00676e697279656b R14: 00007fa1c3a659c0 R15: 00000000006e2b60

[2]
IPVS: sync thread started: state = BACKUP, mcast_ifn = syz_tun, syncid = 4, id = 0
IPVS: stopping backup sync thread 25415 ...

INFO: task syz-executor7:25421 blocked for more than 120 seconds.
       Not tainted 4.16.0-rc6+ #284
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D23688 25421   4408 0x00000004
Call Trace:
  context_switch kernel/sched/core.c:2862 [inline]
  __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
  schedule+0xf5/0x430 kernel/sched/core.c:3499
  schedule_timeout+0x1a3/0x230 kernel/time/timer.c:1777
  do_wait_for_common kernel/sched/completion.c:86 [inline]
  __wait_for_common kernel/sched/completion.c:107 [inline]
  wait_for_common kernel/sched/completion.c:118 [inline]
  wait_for_completion+0x415/0x770 kernel/sched/completion.c:139
  kthread_stop+0x14a/0x7a0 kernel/kthread.c:530
  stop_sync_thread+0x3d9/0x740 net/netfilter/ipvs/ip_vs_sync.c:1996
  do_ip_vs_set_ctl+0x2b1/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2394
  nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
  nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
  ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1253
  sctp_setsockopt+0x2ca/0x63e0 net/sctp/socket.c:4154
  sock_common_setsockopt+0x95/0xd0 net/core/sock.c:3039
  SYSC_setsockopt net/socket.c:1850 [inline]
  SyS_setsockopt+0x189/0x360 net/socket.c:1829
  do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454889
RSP: 002b:00007fc927626c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fc9276276d4 RCX: 0000000000454889
RDX: 000000000000048c RSI: 0000000000000000 RDI: 0000000000000017
RBP: 000000000072bf58 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000051c R14: 00000000006f9b40 R15: 0000000000000001

Showing all locks held in the system:
2 locks held by khungtaskd/868:
  #0:  (rcu_read_lock){....}, at: [<00000000a1a8f002>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
  #0:  (rcu_read_lock){....}, at: [<00000000a1a8f002>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
  #1:  (tasklist_lock){.+.+}, at: [<0000000037c2f8f9>]
debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4247:
  #0:  (&f->f_pos_lock){+.+.}, at: [<000000000d8d6983>]
__fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/4338:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4339:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4340:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4341:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4342:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4343:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4344:
  #0:  (&tty->ldisc_sem){++++}, at: [<00000000bee98654>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
  #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000c1d180aa>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
3 locks held by kworker/0:5/6494:
  #0:  ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
[<00000000a062b18e>] work_static include/linux/workqueue.h:198 [inline]
  #0:  ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
[<00000000a062b18e>] set_work_data kernel/workqueue.c:619 [inline]
  #0:  ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
[<00000000a062b18e>] set_work_pool_and_clear_pending kernel/workqueue.c:646
[inline]
  #0:  ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
[<00000000a062b18e>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
  #1:  ((addr_chk_work).work){+.+.}, at: [<00000000278427d5>]
process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
  #2:  (rtnl_mutex){+.+.}, at: [<00000000066e35ac>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74
1 lock held by syz-executor7/25421:
  #0:  (ipvs->sync_mutex){+.+.}, at: [<00000000d414a689>]
do_ip_vs_set_ctl+0x277/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2393
2 locks held by syz-executor7/25427:
  #0:  (rtnl_mutex){+.+.}, at: [<00000000066e35ac>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74
  #1:  (ipvs->sync_mutex){+.+.}, at: [<00000000e6d48489>]
do_ip_vs_set_ctl+0x10f8/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2388
1 lock held by syz-executor7/25435:
  #0:  (rtnl_mutex){+.+.}, at: [<00000000066e35ac>] rtnl_lock+0x17/0x20

net/core/rtnetlink.c:74
1 lock held by ipvs-b:2:0/25415:
#0: (rtnl_mutex){+.+.}, at: [<00000000066e35ac>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74

---
 net/netfilter/ipvs/ip_vs_ctl.c  |    8 --
 net/netfilter/ipvs/ip_vs_sync.c |  155 ++++++++++++++++++++--------------------
 2 files changed, 80 insertions(+), 83 deletions(-)

@@ -2387,11 +2387,7 @@ do_ip_vs_set_ctl(struct sock *sk, int cm
 			strlcpy(cfg.mcast_ifn, dm->mcast_ifn,
 				sizeof(cfg.mcast_ifn));
 			cfg.syncid = dm->syncid;
-			rtnl_lock();
-			mutex_lock(&ipvs->sync_mutex);
 			ret = start_sync_thread(ipvs, &cfg, dm->state);
-			mutex_unlock(&ipvs->sync_mutex);
-			rtnl_unlock();
 		} else {
 			mutex_lock(&ipvs->sync_mutex);
 			ret = stop_sync_thread(ipvs, dm->state);

@@ -3484,12 +3480,8 @@ static int ip_vs_genl_new_daemon(struct
 	if (ipvs->mixed_address_family_dests > 0)
 		return -EINVAL;
 
-	rtnl_lock();
-	mutex_lock(&ipvs->sync_mutex);
 	ret = start_sync_thread(ipvs, &c,
 				nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
-	mutex_unlock(&ipvs->sync_mutex);
-	rtnl_unlock();
 	return ret;
 }
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Florian Westphal <[email protected]>

commit 3f1e53abff84cf40b1adb3455d480dd295bf42e8 upstream.

Dmitry reports 32bit ebtables on 64bit kernel got broken by a recent change that returns -EINVAL when ruleset has no entries.

ebtables however only counts user-defined chains, so for the initial table nentries will be 0.

Don't try to allocate the compat array in this case, as no user defined rules exist no rule will need 64bit translation.

---
 net/bridge/netfilter/ebtables.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

@@ -1819,13 +1819,14 @@ static int compat_table_info(const struc
 {
 	unsigned int size = info->entries_size;
 	const void *entries = info->entries;
-	int ret;
 
 	newinfo->entries_size = size;
-
-	ret = xt_compat_init_offsets(NFPROTO_BRIDGE, info->nentries);
-	if (ret)
-		return ret;
+	if (info->nentries) {
+		int ret = xt_compat_init_offsets(NFPROTO_BRIDGE,
+						 info->nentries);
+		if (ret)
+			return ret;
+	}
 
 	return EBT_ENTRY_ITERATE(entries, size, compat_calc_entry, info,
 							entries, newinfo);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Tom Herbert <[email protected]>

commit dff8baa261174de689a44572d0ea182d7aa70598 upstream.

In kcm_attach strp_done is called when sk_user_data is already set to fail the attach. strp_done needs the strp to be stopped and warns if it isn't. Call strp_stop in this case to eliminate the warning message.

---
 net/kcm/kcmsock.c |    1 +
 1 file changed, 1 insertion(+)

@@ -1425,6 +1425,7 @@ static int kcm_attach(struct socket *soc
 	 */
 	if (csk->sk_user_data) {
 		write_unlock_bh(&csk->sk_callback_lock);
+		strp_stop(&psock->strp);
 		strp_done(&psock->strp);
 		kmem_cache_free(kcm_psockp, psock);
 		err = -EALREADY;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit a466856e0b7ab269cdf9461886d007e88ff575b0 upstream.

syzbot reported :

BUG: KMSAN: uninit-value in alg_bind+0xe3/0xd90 crypto/af_alg.c:162

We need to check addr_len before dereferencing sa (or uaddr)

---
 crypto/af_alg.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -158,16 +158,16 @@ static int alg_bind(struct socket *sock,
 	void *private;
 	int err;
 
-	/* If caller uses non-allowed flag, return error. */
-	if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed))
-		return -EINVAL;
-
 	if (sock->state == SS_CONNECTED)
 		return -EINVAL;
 
 	if (addr_len < sizeof(*sa))
 		return -EINVAL;
 
+	/* If caller uses non-allowed flag, return error. */
+	if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed))
+		return -EINVAL;
+
 	sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
 	sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0;
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit 6091f09c2f79730d895149bcfe3d66140288cd0e upstream.

syzbot reported :

BUG: KMSAN: uninit-value in ffs arch/x86/include/asm/bitops.h:432 [inline]
BUG: KMSAN: uninit-value in netlink_sendmsg+0xb26/0x1310 net/netlink/af_netlink.c:1851

---
 net/netlink/af_netlink.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -1813,6 +1813,8 @@ static int netlink_sendmsg(struct socket
 
 	if (msg->msg_namelen) {
 		err = -EINVAL;
+		if (msg->msg_namelen < sizeof(struct sockaddr_nl))
+			goto out;
 		if (addr->nl_family != AF_NETLINK)
 			goto out;
 		dst_portid = addr->nl_pid;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit b1993a2de12c9e75c35729e2ffbc3a92d50c0d31 upstream.

syzbot reported :

BUG: KMSAN: uninit-value in rtnh_ok include/net/nexthop.h:11 [inline]
BUG: KMSAN: uninit-value in fib_count_nexthops net/ipv4/fib_semantics.c:469 [inline]
BUG: KMSAN: uninit-value in fib_create_info+0x554/0x8d20 net/ipv4/fib_semantics.c:1091

@remaining is an integer, coming from user space. If it is negative we want rtnh_ok() to return false.

---
 include/net/nexthop.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -7,7 +7,7 @@
 
 static inline int rtnh_ok(const struct rtnexthop *rtnh, int remaining)
 {
-	return remaining >= sizeof(*rtnh) &&
+	return remaining >= (int)sizeof(*rtnh) &&
 	       rtnh->rtnh_len >= sizeof(*rtnh) &&
 	       rtnh->rtnh_len <= remaining;
 }

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit b13dda9f9aa7caceeee61c080c2e544d5f5d85e5 upstream.

syzbot reported __skb_try_recv_from_queue() was using skb->peeked while it was potentially unitialized.

We need to clear it in __skb_clone()

---
 net/core/skbuff.c |    1 +
 1 file changed, 1 insertion(+)

@@ -857,6 +857,7 @@ static struct sk_buff *__skb_clone(struc
 	n->hdr_len = skb->nohdr ? skb_headroom(skb) : skb->hdr_len;
 	n->cloned = 1;
 	n->nohdr = 0;
+	n->peeked = 0;
 	n->destructor = NULL;
 	C(tail);
 	C(end);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit 77d36398d99f2565c0a8d43a86fd520a82e64bb8 upstream.

syzbot complained :

BUG: KMSAN: uninit-value in memcmp+0x119/0x180 lib/string.c:861
CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 memcmp+0x119/0x180 lib/string.c:861
 __hw_addr_add_ex net/core/dev_addr_lists.c:60 [inline]
 __dev_mc_add+0x1c2/0x8e0 net/core/dev_addr_lists.c:670
 dev_mc_add+0x6d/0x80 net/core/dev_addr_lists.c:687
 igmp6_group_added+0x2db/0xa00 net/ipv6/mcast.c:662
 ipv6_dev_mc_inc+0xe9e/0x1130 net/ipv6/mcast.c:914
 addrconf_join_solict net/ipv6/addrconf.c:2078 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:3828 [inline]
 addrconf_dad_work+0x427/0x2150 net/ipv6/addrconf.c:3954
 process_one_work+0x12c6/0x1f60 kernel/workqueue.c:2113
 worker_thread+0x113c/0x24f0 kernel/workqueue.c:2247
 kthread+0x539/0x720 kernel/kthread.c:239

---
 net/core/dev_addr_lists.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -57,8 +57,8 @@ static int __hw_addr_add_ex(struct netde
 		return -EINVAL;
 
 	list_for_each_entry(ha, &list->list, list) {
-		if (!memcmp(ha->addr, addr, addr_len) &&
-		    ha->type == addr_type) {
+		if (ha->type == addr_type &&
+		    !memcmp(ha->addr, addr, addr_len)) {
 			if (global) {
 				/* check if addr is already used as global */
 				if (ha->global_use)

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit b855ff827476adbdc2259e9895681d82b7b26065 upstream.

syzbot reported an uninit-value read of skb->mark in iptable_mangle_hook()

Thanks to the nice report, I tracked the problem to dccp not caring of ireq->ir_mark for passive sessions.

BUG: KMSAN: uninit-value in ipt_mangle_out net/ipv4/netfilter/iptable_mangle.c:66 [inline]
BUG: KMSAN: uninit-value in iptable_mangle_hook+0x5e5/0x720 net/ipv4/netfilter/iptable_mangle.c:84
CPU: 0 PID: 5300 Comm: syz-executor3 Not tainted 4.16.0+ #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 ipt_mangle_out net/ipv4/netfilter/iptable_mangle.c:66 [inline]
 iptable_mangle_hook+0x5e5/0x720 net/ipv4/netfilter/iptable_mangle.c:84
 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline]
 nf_hook_slow+0x158/0x3d0 net/netfilter/core.c:483
 nf_hook include/linux/netfilter.h:243 [inline]
 __ip_local_out net/ipv4/ip_output.c:113 [inline]
 ip_local_out net/ipv4/ip_output.c:122 [inline]
 ip_queue_xmit+0x1d21/0x21c0 net/ipv4/ip_output.c:504
 dccp_transmit_skb+0x15eb/0x1900 net/dccp/output.c:142
 dccp_xmit_packet+0x814/0x9e0 net/dccp/output.c:281
 dccp_write_xmit+0x20f/0x480 net/dccp/output.c:363
 dccp_sendmsg+0x12ca/0x12d0 net/dccp/proto.c:818
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007f1a4473dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1a4473e6d4 RCX: 0000000000455259
RDX: 0000000000000000 RSI: 0000000020b76fc8 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004f0 R14: 00000000006fa720 R15: 0000000000000000

Uninit was stored to memory at:

 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 ip_queue_xmit+0x1e35/0x21c0 net/ipv4/ip_output.c:502
 dccp_transmit_skb+0x15eb/0x1900 net/dccp/output.c:142
 dccp_xmit_packet+0x814/0x9e0 net/dccp/output.c:281
 dccp_write_xmit+0x20f/0x480 net/dccp/output.c:363
 dccp_sendmsg+0x12ca/0x12d0 net/dccp/proto.c:818
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 inet_csk_clone_lock+0x503/0x580 net/ipv4/inet_connection_sock.c:797
 dccp_create_openreq_child+0x7f/0x890 net/dccp/minisocks.c:92
 dccp_v4_request_recv_sock+0x22c/0xe90 net/dccp/ipv4.c:408
 dccp_v6_request_recv_sock+0x290/0x2000 net/dccp/ipv6.c:414
 dccp_check_req+0x7b9/0x8f0 net/dccp/minisocks.c:197
 dccp_v4_rcv+0x12e4/0x2630 net/dccp/ipv4.c:840
 ip_local_deliver_finish+0x6ed/0xd40 net/ipv4/ip_input.c:216
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_local_deliver+0x43c/0x4e0 net/ipv4/ip_input.c:257
 dst_input include/net/dst.h:449 [inline]
 ip_rcv_finish+0x1253/0x16d0 net/ipv4/ip_input.c:397
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_rcv+0x119d/0x16f0 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x47cf/0x4a80 net/core/dev.c:4562
 __netif_receive_skb net/core/dev.c:4627 [inline]
 process_backlog+0x62d/0xe20 net/core/dev.c:5307
 napi_poll net/core/dev.c:5705 [inline]
 net_rx_action+0x7c1/0x1a70 net/core/dev.c:5771
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmem_cache_alloc+0xaab/0xb90 mm/slub.c:2756
 reqsk_alloc include/net/request_sock.h:88 [inline]
 inet_reqsk_alloc+0xc4/0x7f0 net/ipv4/tcp_input.c:6145
 dccp_v4_conn_request+0x5cc/0x1770 net/dccp/ipv4.c:600
 dccp_v6_conn_request+0x299/0x1880 net/dccp/ipv6.c:317
 dccp_rcv_state_process+0x2ea/0x2410 net/dccp/input.c:612
 dccp_v4_do_rcv+0x229/0x340 net/dccp/ipv4.c:682
 dccp_v6_do_rcv+0x16d/0x1220 net/dccp/ipv6.c:578
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __sk_receive_skb+0x60e/0xf20 net/core/sock.c:513
 dccp_v4_rcv+0x24d4/0x2630 net/dccp/ipv4.c:874
 ip_local_deliver_finish+0x6ed/0xd40 net/ipv4/ip_input.c:216
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_local_deliver+0x43c/0x4e0 net/ipv4/ip_input.c:257
 dst_input include/net/dst.h:449 [inline]
 ip_rcv_finish+0x1253/0x16d0 net/ipv4/ip_input.c:397
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_rcv+0x119d/0x16f0 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x47cf/0x4a80 net/core/dev.c:4562
 __netif_receive_skb net/core/dev.c:4627 [inline]
 process_backlog+0x62d/0xe20 net/core/dev.c:5307
 napi_poll net/core/dev.c:5705 [inline]
 net_rx_action+0x7c1/0x1a70 net/core/dev.c:5771
 __do_softirq+0x56d/0x93d kernel/softirq.c:285

---
 net/dccp/ipv4.c |    1 +
 net/dccp/ipv6.c |    1 +
 2 files changed, 2 insertions(+)

@@ -614,6 +614,7 @@ int dccp_v4_conn_request(struct sock *sk
 	ireq = inet_rsk(req);
 	sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr);
 	sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr);
+	ireq->ir_mark = inet_request_mark(sk, skb);
 	ireq->ireq_family = AF_INET;
 	ireq->ir_iif = sk->sk_bound_dev_if;
 

@@ -351,6 +351,7 @@ static int dccp_v6_conn_request(struct s
 	ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
 	ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
 	ireq->ireq_family = AF_INET6;
+	ireq->ir_mark = inet_request_mark(sk, skb);
 
 	if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
 	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit d0ea2b12500543535be3f54e17920fffc9bb45f6 upstream.

syzbot complained that res.type could be used while not initialized.

Using RTN_UNSPEC as initial value seems better than using garbage.

BUG: KMSAN: uninit-value in __mkroute_output net/ipv4/route.c:2200 [inline]
BUG: KMSAN: uninit-value in ip_route_output_key_hash_rcu+0x31f0/0x3940 net/ipv4/route.c:2493
CPU: 1 PID: 12207 Comm: syz-executor0 Not tainted 4.16.0+ #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 __mkroute_output net/ipv4/route.c:2200 [inline]
 ip_route_output_key_hash_rcu+0x31f0/0x3940 net/ipv4/route.c:2493
 ip_route_output_key_hash net/ipv4/route.c:2322 [inline]
 __ip_route_output_key include/net/route.h:126 [inline]
 ip_route_output_flow+0x1eb/0x3c0 net/ipv4/route.c:2577
 raw_sendmsg+0x1861/0x3ed0 net/ipv4/raw.c:653
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455259
RSP: 002b:00007fdc0625dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fdc0625e6d4 RCX: 0000000000455259
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000020000080 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004f7 R14: 00000000006fa7c8 R15: 0000000000000000

Local variable description: ----res.i.i@ip_route_output_flow Variable was created at:

 ip_route_output_flow+0x75/0x3c0 net/ipv4/route.c:2576
 raw_sendmsg+0x1861/0x3ed0 net/ipv4/raw.c:653

---
 net/ipv4/route.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

@@ -2288,13 +2288,14 @@ struct rtable *ip_route_output_key_hash(
 					const struct sk_buff *skb)
 {
 	__u8 tos = RT_FL_TOS(fl4);
-	struct fib_result res;
+	struct fib_result res = {
+		.type		= RTN_UNSPEC,
+		.fi		= NULL,
+		.table		= NULL,
+		.tclassid	= 0,
+	};
 	struct rtable *rth;
 
-	res.tclassid	= 0;
-	res.fi		= NULL;
-	res.table	= NULL;
-
 	fl4->flowi4_iif = LOOPBACK_IFINDEX;
 	fl4->flowi4_tos = tos & IPTOS_RT_MASK;
 	fl4->flowi4_scope = ((tos & RTO_ONLINK) ?

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit 3099a52918937ab86ec47038ad80d377ba16c531 upstream.

syzbot reported an uninit-value in inet_csk_bind_conflict() [1]

It turns out we never propagated sk->sk_reuseport into timewait socket.

[1]

BUG: KMSAN: uninit-value in inet_csk_bind_conflict+0x5f9/0x990 net/ipv4/inet_connection_sock.c:151
CPU: 1 PID: 3589 Comm: syzkaller008242 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 inet_csk_bind_conflict+0x5f9/0x990 net/ipv4/inet_connection_sock.c:151
 inet_csk_get_port+0x1d28/0x1e40 net/ipv4/inet_connection_sock.c:320
 inet6_bind+0x121c/0x1820 net/ipv6/af_inet6.c:399
 SYSC_bind+0x3f2/0x4b0 net/socket.c:1474
 SyS_bind+0x54/0x80 net/socket.c:1460
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x4416e9
RSP: 002b:00007ffce6d15c88 EFLAGS: 00000217 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0100000000000000 RCX: 00000000004416e9
RDX: 000000000000001c RSI: 0000000020402000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00000000e6d15e08 R09: 00000000e6d15e08
R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000009478
R13: 00000000006cd448 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:

 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 tcp_time_wait+0xf17/0xf50 net/ipv4/tcp_minisocks.c:283
 tcp_rcv_state_process+0xebe/0x6490 net/ipv4/tcp_input.c:6003
 tcp_v6_do_rcv+0x11dd/0x1d90 net/ipv6/tcp_ipv6.c:1331
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 tcp_close+0x277/0x18f0 net/ipv4/tcp.c:2269
 inet_release+0x240/0x2a0 net/ipv4/af_inet.c:427
 inet6_release+0xaf/0x100 net/ipv6/af_inet6.c:435
 sock_release net/socket.c:595 [inline]
 sock_close+0xe0/0x300 net/socket.c:1149
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x10e1/0x38d0 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 SYSC_exit_group+0x21/0x30 kernel/exit.c:981
 SyS_exit_group+0x25/0x30 kernel/exit.c:979
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 inet_twsk_alloc+0xaef/0xc00 net/ipv4/inet_timewait_sock.c:182
 tcp_time_wait+0xd9/0xf50 net/ipv4/tcp_minisocks.c:258
 tcp_rcv_state_process+0xebe/0x6490 net/ipv4/tcp_input.c:6003
 tcp_v6_do_rcv+0x11dd/0x1d90 net/ipv6/tcp_ipv6.c:1331
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 tcp_close+0x277/0x18f0 net/ipv4/tcp.c:2269
 inet_release+0x240/0x2a0 net/ipv4/af_inet.c:427
 inet6_release+0xaf/0x100 net/ipv6/af_inet6.c:435
 sock_release net/socket.c:595 [inline]
 sock_close+0xe0/0x300 net/socket.c:1149
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x10e1/0x38d0 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 SYSC_exit_group+0x21/0x30 kernel/exit.c:981
 SyS_exit_group+0x25/0x30 kernel/exit.c:979
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmem_cache_alloc+0xaab/0xb90 mm/slub.c:2756
 inet_twsk_alloc+0x13b/0xc00 net/ipv4/inet_timewait_sock.c:163
 tcp_time_wait+0xd9/0xf50 net/ipv4/tcp_minisocks.c:258
 tcp_rcv_state_process+0xebe/0x6490 net/ipv4/tcp_input.c:6003
 tcp_v6_do_rcv+0x11dd/0x1d90 net/ipv6/tcp_ipv6.c:1331
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 tcp_close+0x277/0x18f0 net/ipv4/tcp.c:2269
 inet_release+0x240/0x2a0 net/ipv4/af_inet.c:427
 inet6_release+0xaf/0x100 net/ipv6/af_inet6.c:435
 sock_release net/socket.c:595 [inline]
 sock_close+0xe0/0x300 net/socket.c:1149
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x10e1/0x38d0 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 SYSC_exit_group+0x21/0x30 kernel/exit.c:981
 SyS_exit_group+0x25/0x30 kernel/exit.c:979
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2

---
 include/net/inet_timewait_sock.h |    1 +
 net/ipv4/inet_timewait_sock.c    |    1 +
 2 files changed, 2 insertions(+)

@@ -43,6 +43,7 @@ struct inet_timewait_sock {
 #define tw_family		__tw_common.skc_family
 #define tw_state		__tw_common.skc_state
 #define tw_reuse		__tw_common.skc_reuse
+#define tw_reuseport		__tw_common.skc_reuseport
 #define tw_ipv6only		__tw_common.skc_ipv6only
 #define tw_bound_dev_if		__tw_common.skc_bound_dev_if
 #define tw_node			__tw_common.skc_nulls_node

@@ -179,6 +179,7 @@ struct inet_timewait_sock *inet_twsk_all
 		tw->tw_dport	    = inet->inet_dport;
 		tw->tw_family	    = sk->sk_family;
 		tw->tw_reuse	    = sk->sk_reuse;
+		tw->tw_reuseport    = sk->sk_reuseport;
 		tw->tw_hash	    = sk->sk_hash;
 		tw->tw_ipv6only	    = 0;
 		tw->tw_transparent  = inet->transparent;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit b6a37e5e25414df4b8e9140a5c6f5ee0ec6f3b90 upstream.

syzbot/KMSAN reported that p->dtime was read while it was not yet initialized in :

	delta = (__u32)jiffies - p->dtime;
	if (delta < ttl || !refcount_dec_if_one(&p->refcnt))
		gc_stack[i] = NULL;

This is a false positive, because the inetpeer wont be erased from rb-tree if the refcount_dec_if_one(&p->refcnt) does not succeed. And this wont happen before first inet_putpeer() call for this inetpeer has been done, and ->dtime field is written exactly before the refcount_dec_and_test(&p->refcnt).

The KMSAN report was :

BUG: KMSAN: uninit-value in inet_peer_gc net/ipv4/inetpeer.c:163 [inline]
BUG: KMSAN: uninit-value in inet_getpeer+0x1567/0x1e70 net/ipv4/inetpeer.c:228
CPU: 0 PID: 9494 Comm: syz-executor5 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 inet_peer_gc net/ipv4/inetpeer.c:163 [inline]
 inet_getpeer+0x1567/0x1e70 net/ipv4/inetpeer.c:228
 inet_getpeer_v4 include/net/inetpeer.h:110 [inline]
 icmpv4_xrlim_allow net/ipv4/icmp.c:330 [inline]
 icmp_send+0x2b44/0x3050 net/ipv4/icmp.c:725
 ip_options_compile+0x237c/0x29f0 net/ipv4/ip_options.c:472
 ip_rcv_options net/ipv4/ip_input.c:284 [inline]
 ip_rcv_finish+0xda8/0x16d0 net/ipv4/ip_input.c:365
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_rcv+0x119d/0x16f0 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x47cf/0x4a80 net/core/dev.c:4562
 __netif_receive_skb net/core/dev.c:4627 [inline]
 netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701
 netif_receive_skb+0x230/0x240 net/core/dev.c:4725
 tun_rx_batched drivers/net/tun.c:1555 [inline]
 tun_get_user+0x6d88/0x7580 drivers/net/tun.c:1962
 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990
 do_iter_readv_writev+0x7bb/0x970 include/linux/fs.h:1776
 do_iter_write+0x30d/0xd40 fs/read_write.c:932
 vfs_writev fs/read_write.c:977 [inline]
 do_writev+0x3c9/0x830 fs/read_write.c:1012
 SYSC_writev+0x9b/0xb0 fs/read_write.c:1085
 SyS_writev+0x56/0x80 fs/read_write.c:1082
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455111
RSP: 002b:00007fae0365cba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000000002e RCX: 0000000000455111
RDX: 0000000000000001 RSI: 00007fae0365cbf0 RDI: 00000000000000fc
RBP: 0000000020000040 R08: 00000000000000fc R09: 0000000000000000
R10: 000000000000002e R11: 0000000000000293 R12: 00000000ffffffff
R13: 0000000000000658 R14: 00000000006fc8e0 R15: 0000000000000000

Uninit was created at:

 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmem_cache_alloc+0xaab/0xb90 mm/slub.c:2756
 inet_getpeer+0xed8/0x1e70 net/ipv4/inetpeer.c:210
 inet_getpeer_v4 include/net/inetpeer.h:110 [inline]
 ip4_frag_init+0x4d1/0x740 net/ipv4/ip_fragment.c:153
 inet_frag_alloc net/ipv4/inet_fragment.c:369 [inline]
 inet_frag_create net/ipv4/inet_fragment.c:385 [inline]
 inet_frag_find+0x7da/0x1610 net/ipv4/inet_fragment.c:418
 ip_find net/ipv4/ip_fragment.c:275 [inline]
 ip_defrag+0x448/0x67a0 net/ipv4/ip_fragment.c:676
 ip_check_defrag+0x775/0xda0 net/ipv4/ip_fragment.c:724
 packet_rcv_fanout+0x2a8/0x8d0 net/packet/af_packet.c:1447
 deliver_skb net/core/dev.c:1897 [inline]
 deliver_ptype_list_skb net/core/dev.c:1912 [inline]
 __netif_receive_skb_core+0x314a/0x4a80 net/core/dev.c:4545
 __netif_receive_skb net/core/dev.c:4627 [inline]
 netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701
 netif_receive_skb+0x230/0x240 net/core/dev.c:4725
 tun_rx_batched drivers/net/tun.c:1555 [inline]
 tun_get_user+0x6d88/0x7580 drivers/net/tun.c:1962
 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990
 do_iter_readv_writev+0x7bb/0x970 include/linux/fs.h:1776
 do_iter_write+0x30d/0xd40 fs/read_write.c:932
 vfs_writev fs/read_write.c:977 [inline]
 do_writev+0x3c9/0x830 fs/read_write.c:1012
 SYSC_writev+0x9b/0xb0 fs/read_write.c:1085
 SyS_writev+0x56/0x80 fs/read_write.c:1082
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2

---
 net/ipv4/inetpeer.c |    1 +
 1 file changed, 1 insertion(+)

@@ -210,6 +210,7 @@ struct inet_peer *inet_getpeer(struct in
 		p = kmem_cache_alloc(peer_cachep, GFP_ATOMIC);
 		if (p) {
 			p->daddr = *daddr;
+			p->dtime = (__u32)jiffies;
 			refcount_set(&p->refcnt, 2);
 			atomic_set(&p->rid, 0);
 			p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Michal Hocko <[email protected]>

commit 4eaf431f6f71bbed40a4c733ffe93a7e8cedf9d9 upstream.

syzbot has triggered a NULL ptr dereference when allocation fault injection enforces a failure and alloc_mem_cgroup_per_node_info initializes memcg->nodeinfo only half way through.

But __mem_cgroup_free still tries to free all per-node data and dereferences pn->lruvec_stat_cpu unconditioanlly even if the specific per-node data hasn't been initialized.

The bug is quite unlikely to hit because small allocations do not fail and we would need quite some numa nodes to make struct mem_cgroup_per_node large enough to cross the costly order.

---
 mm/memcontrol.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -4187,6 +4187,9 @@ static void free_mem_cgroup_per_node_inf
 {
 	struct mem_cgroup_per_node *pn = memcg->nodeinfo[node];
 
+	if (!pn)
+		return;
+
 	free_percpu(pn->lruvec_stat);
 	kfree(pn);
 }

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jiri Olsa <[email protected]>

commit bfb3d7b8b906b66551424d7636182126e1d134c8 upstream.

If the get_callchain_buffers fails to allocate the buffer it will decrease the nr_callchain_events right away.

There's no point of checking the allocation error for nr_callchain_events > 1. Removing that check.

---
 kernel/events/callchain.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

@@ -131,14 +131,8 @@ int get_callchain_buffers(int event_max_
 		goto exit;
 	}
 
-	if (count > 1) {
-		/* If the allocation failed, give up */
-		if (!callchain_cpus_entries)
-			err = -ENOMEM;
-		goto exit;
-	}
-
-	err = alloc_callchain_buffers();
+	if (count == 1)
+		err = alloc_callchain_buffers();
 exit:
 	if (err)
 		atomic_dec(&nr_callchain_events);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

commit bf2acc943a45d2b2e8a9f1a5ddff6b6e43cc69d9 upstream.

syzbot is able to produce a nasty WARN_ON() in tcp_verify_left_out() with following C-repro :

socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
setsockopt(3, SOL_TCP, TCP_REPAIR, [1], 4) = 0
setsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [-1], 4) = 0
bind(3, {sa_family=AF_INET, sin_port=htons(20002), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 sendto(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,

	1242, MSG_FASTOPEN, {sa_family=AF_INET, sin_port=htons(20002), sin_addr=inet_addr("127.0.0.1")}, 16) = 1242

setsockopt(3, SOL_TCP, TCP_REPAIR_WINDOW, "\4\0\0@+\205\0\0\377\377\0\0\377\377\377\177\0\0\0\0", 20) = 0
writev(3, [{"\270", 1}], 1) = 1
setsockopt(3, SOL_TCP, TCP_REPAIR_OPTIONS, "\10\0\0\0\0\0\0\0\0\0\0\0|\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 386) = 0 writev(3, [{"\210v\r[\226\320t\231qwQ\204\264l\254\t\1\20\245\214p\350H\223\254;\\\37\345\307p$"..., 3144}], 1) = 3144

The 3rd system call looks odd :
setsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [-1], 4) = 0

This patch makes sure bound checking is using an unsigned compare.

---
 net/ipv4/tcp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2601,7 +2601,7 @@ static int do_tcp_setsockopt(struct sock
 	case TCP_REPAIR_QUEUE:
 		if (!tp->repair)
 			err = -EPERM;
-		else if (val < TCP_QUEUES_NR)
+		else if ((unsigned int)val < TCP_QUEUES_NR)
 			tp->repair_queue = val;
 		else
 			err = -EINVAL;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Tetsuo Handa <[email protected]>

commit 8236b0ae31c837d2b3a2565c5f8d77f637e824cc upstream.

syzbot is reporting hung tasks at wait_on_bit(WB_shutting_down) in wb_shutdown() [1]. This seems to be because commit 5318ce7d46866e1d ("bdi:
Shutdown writeback on all cgwbs in cgwb_bdi_destroy()") forgot to call wake_up_bit(WB_shutting_down) after clear_bit(WB_shutting_down).

Introduce a helper function clear_and_wake_up_bit() and use it, in order to avoid similar errors in future.

[1] https://syzkaller.appspot.com/bug?id=b297474817af98d5796bc544e1bb806fc3da0e5e

---
 include/linux/wait_bit.h |   17 +++++++++++++++++
 mm/backing-dev.c         |    2 +-
 2 files changed, 18 insertions(+), 1 deletion(-)

@@ -259,4 +259,21 @@ int wait_on_atomic_t(atomic_t *val, int
 	return out_of_line_wait_on_atomic_t(val, action, mode);
 }
 
+/**
+ * clear_and_wake_up_bit - clear a bit and wake up anyone waiting on that bit
+ *
+ * @bit: the bit of the word being waited on
+ * @word: the word being waited on, a kernel virtual address
+ *
+ * You can use this helper if bitflags are manipulated atomically rather than
+ * non-atomically under a lock.
+ */
+static inline void clear_and_wake_up_bit(int bit, void *word)
+{
+	clear_bit_unlock(bit, word);
+	/* See wake_up_bit() for which memory barrier you need to use. */
+	smp_mb__after_atomic();
+	wake_up_bit(word, bit);
+}
+
 #endif /* _LINUX_WAIT_BIT_H */

@@ -381,7 +381,7 @@ static void wb_shutdown(struct bdi_write
 	 * the barrier provided by test_and_clear_bit() above.
 	 */
 	smp_wmb();
-	clear_bit(WB_shutting_down, &wb->state);
+	clear_and_wake_up_bit(WB_shutting_down, &wb->state);
 }
 
 static void wb_exit(struct bdi_writeback *wb)

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jan Kara <[email protected]>

commit b8b784958eccbf8f51ebeee65282ca3fd59ea391 upstream.

Syzbot has reported that it can hit a NULL pointer dereference in wb_workfn() due to wb->bdi->dev being NULL. This indicates that wb_workfn() was called for an already unregistered bdi which should not happen as wb_shutdown() called from bdi_unregister() should make sure all pending writeback works are completed before bdi is unregistered. Except that wb_workfn() itself can requeue the work with:

	mod_delayed_work(bdi_wq, &wb->dwork, 0);

and if this happens while wb_shutdown() is waiting in:

	flush_delayed_work(&wb->dwork);

the dwork can get executed after wb_shutdown() has finished and bdi_unregister() has cleared wb->bdi->dev.

Make wb_workfn() use wakeup_wb() for requeueing the work which takes all the necessary precautions against racing with bdi unregistration.

---
 fs/fs-writeback.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1940,7 +1940,7 @@ void wb_workfn(struct work_struct *work)
 	}
 
 	if (!list_empty(&wb->work_list))
-		mod_delayed_work(bdi_wq, &wb->dwork, 0);
+		wb_wakeup(wb);
 	else if (wb_has_dirty_io(wb) && dirty_writeback_interval)
 		wb_wakeup_delayed(wb);
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Paul Mackerras <[email protected]>

commit a8b48a4dccea77e29462e59f1dbf0d5aa1ff167c upstream.

This fixes a bug where the trap number that is returned by __kvmppc_vcore_entry gets corrupted. The effect of the corruption is that IPIs get ignored on POWER9 systems when the IPI is sent via a doorbell interrupt to a CPU which is executing in a KVM guest. The effect of the IPI being ignored is often that another CPU locks up inside smp_call_function_many() (and if that CPU is holding a spinlock, other CPUs then lock up inside raw_spin_lock()).

The trap number is currently held in register r12 for most of the assembly-language part of the guest exit path. In that path, we call kvmppc_subcore_exit_guest(), which is a C function, without restoring r12 afterwards. Depending on the kernel config and the compiler, it may modify r12 or it may not, so some config/compiler combinations see the bug and others don't.

To fix this, we arrange for the trap number to be stored on the stack from the 'guest_bypass:' label until the end of the function, then the trap number is loaded and returned in r12 as before.

---
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

@@ -308,7 +308,6 @@ kvm_novcpu_exit:
 	stw	r12, STACK_SLOT_TRAP(r1)
 	bl	kvmhv_commence_exit
 	nop
-	lwz	r12, STACK_SLOT_TRAP(r1)
 	b	kvmhv_switch_to_host
 
 /*

@@ -1136,6 +1135,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 
 secondary_too_late:
 	li	r12, 0
+	stw	r12, STACK_SLOT_TRAP(r1)
 	cmpdi	r4, 0
 	beq	11f
 	stw	r12, VCPU_TRAP(r4)

@@ -1445,12 +1445,12 @@ mc_cont:
 1:
 #endif /* CONFIG_KVM_XICS */
 
+	stw	r12, STACK_SLOT_TRAP(r1)
 	mr 	r3, r12
 	/* Increment exit count, poke other threads to exit */
 	bl	kvmhv_commence_exit
 	nop
 	ld	r9, HSTATE_KVM_VCPU(r13)
-	lwz	r12, VCPU_TRAP(r9)
 
 	/* Stop others sending VCPU interrupts to this physical CPU */
 	li	r0, -1

@@ -1816,6 +1816,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1
 	 * POWER7/POWER8 guest -> host partition switch code.
 	 * We don't have to lock against tlbies but we do
 	 * have to coordinate the hardware threads.
+	 * Here STACK_SLOT_TRAP(r1) contains the trap number.
 	 */
 kvmhv_switch_to_host:
 	/* Secondary threads wait for primary to do partition switch */

@@ -1868,11 +1869,11 @@ BEGIN_FTR_SECTION
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 
 	/* If HMI, call kvmppc_realmode_hmi_handler() */
+	lwz	r12, STACK_SLOT_TRAP(r1)
 	cmpwi	r12, BOOK3S_INTERRUPT_HMI
 	bne	27f
 	bl	kvmppc_realmode_hmi_handler
 	nop
-	li	r12, BOOK3S_INTERRUPT_HMI
 	/*
 	 * At this point kvmppc_realmode_hmi_handler would have resync-ed
 	 * the TB. Hence it is not required to subtract guest timebase

@@ -1950,6 +1951,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_R
 	li	r0, KVM_GUEST_MODE_NONE
 	stb	r0, HSTATE_IN_GUEST(r13)
 
+	lwz	r12, STACK_SLOT_TRAP(r1)	/* return trap # in r12 */
 	ld	r0, SFS+PPC_LR_STKOFF(r1)
 	addi	r1, r1, SFS
 	mtlr	r0

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Laurent Vivier <[email protected]>

commit 61bd0f66ff92d5ce765ff9850fd3cbfec773c560 upstream.

Since commit 8b24e69fc47e ("KVM: PPC: Book3S HV: Close race with testing for signals on guest entry"), if CONFIG_VIRT_CPU_ACCOUNTING_GEN is set, the guest time is not accounted to guest time and user time, but instead to system time.

This is because guest_enter()/guest_exit() are called while interrupts are disabled and the tick counter cannot be updated between them.

To fix that, move guest_exit() after local_irq_enable(), and as guest_enter() is called with IRQ disabled, call guest_enter_irqoff() instead.

---
 arch/powerpc/kvm/book3s_hv.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

@@ -2847,7 +2847,7 @@ static noinline void kvmppc_run_core(str
 	 */
 	trace_hardirqs_on();
 
-	guest_enter();
+	guest_enter_irqoff();
 
 	srcu_idx = srcu_read_lock(&vc->kvm->srcu);
 

@@ -2855,8 +2855,6 @@ static noinline void kvmppc_run_core(str
 
 	srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
 
-	guest_exit();
-
 	trace_hardirqs_off();
 	set_irq_happened(trap);
 

@@ -2890,6 +2888,7 @@ static noinline void kvmppc_run_core(str
 	kvmppc_set_host_core(pcpu);
 
 	local_irq_enable();
+	guest_exit();
 
 	/* Let secondaries go back to the offline loop */
 	for (i = 0; i < controlled_threads; ++i) {

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Paul Mackerras <[email protected]>

commit debd574f4195e205ba505b25e19b2b797f4bcd94 upstream.

The current code for initializing the VRMA (virtual real memory area) for HPT guests requires the page size of the backing memory to be one of 4kB, 64kB or 16MB. With a radix host we have the possibility that the backing memory page size can be 2MB or 1GB. In these cases, if the guest switches to HPT mode, KVM will not initialize the VRMA and the guest will fail to run.

In fact it is not necessary that the VRMA page size is the same as the backing memory page size; any VRMA page size less than or equal to the backing memory page size is acceptable. Therefore we now choose the largest page size out of the set {4k, 64k, 16M} which is not larger than the backing memory page size.

---
 arch/powerpc/kvm/book3s_hv.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

@@ -3618,15 +3618,17 @@ static int kvmppc_hv_setup_htab_rma(stru
 		goto up_out;
 
 	psize = vma_kernel_pagesize(vma);
-	porder = __ilog2(psize);
 
 	up_read(&current->mm->mmap_sem);
 
 	/* We can handle 4k, 64k or 16M pages in the VRMA */
-	err = -EINVAL;
-	if (!(psize == 0x1000 || psize == 0x10000 ||
-	      psize == 0x1000000))
-		goto out_srcu;
+	if (psize >= 0x1000000)
+		psize = 0x1000000;
+	else if (psize >= 0x10000)
+		psize = 0x10000;
+	else
+		psize = 0x1000;
+	porder = __ilog2(psize);
 
 	senc = slb_pgsize_encoding(psize);
 	kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Suzuki K Poulose <[email protected]>

commit ece1397cbc89c51914fae1aec729539cfd8bd62b upstream.

Some variants of the Arm Cortex-55 cores (r0p0, r0p1, r1p0) suffer from an erratum 1024718, which causes incorrect updates when DBM/AP bits in a page table entry is modified without a break-before-make sequence. The work around is to skip enabling the hardware DBM feature on the affected cores. The hardware Access Flag management features is not affected. There are some other cores suffering from this errata, which could be added to the midr_list to trigger the work around.

---
 Documentation/arm64/silicon-errata.txt |    1 
 arch/arm64/Kconfig                     |   14 +++++++++++
 arch/arm64/include/asm/assembler.h     |   40 +++++++++++++++++++++++++++++++++
 arch/arm64/include/asm/cputype.h       |    2 +
 arch/arm64/mm/proc.S                   |    5 ++++
 5 files changed, 62 insertions(+)

@@ -55,6 +55,7 @@ stable kernels.
 | ARM            | Cortex-A57      | #834220         | ARM64_ERRATUM_834220        |
 | ARM            | Cortex-A72      | #853709         | N/A                         |
 | ARM            | Cortex-A73      | #858921         | ARM64_ERRATUM_858921        |
+| ARM            | Cortex-A55      | #1024718        | ARM64_ERRATUM_1024718       |
 | ARM            | MMU-500         | #841119,#826419 | N/A                         |
 |                |                 |                 |                             |
 | Cavium         | ThunderX ITS    | #22375, #24313  | CAVIUM_ERRATUM_22375        |

@@ -443,6 +443,20 @@ config ARM64_ERRATUM_843419
 
 	  If unsure, say Y.
 
+config ARM64_ERRATUM_1024718
+	bool "Cortex-A55: 1024718: Update of DBM/AP bits without break before make might result in incorrect update"
+	default y
+	help
+	  This option adds work around for Arm Cortex-A55 Erratum 1024718.
+
+	  Affected Cortex-A55 cores (r0p0, r0p1, r1p0) could cause incorrect
+	  update of the hardware dirty bit when the DBM/AP bits are updated
+	  without a break-before-make. The work around is to disable the usage
+	  of hardware DBM locally on the affected cores. CPUs not affected by
+	  erratum will continue to use the feature.
+
+	  If unsure, say Y.
+
 config CAVIUM_ERRATUM_22375
 	bool "Cavium erratum 22375, 24313"
 	default y

@@ -25,6 +25,7 @@
 
 #include <asm/asm-offsets.h>
 #include <asm/cpufeature.h>
+#include <asm/cputype.h>
 #include <asm/page.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/ptrace.h>

@@ -495,4 +496,43 @@ alternative_endif
 	and	\phys, \pte, #(((1 << (48 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
 	.endm
 
+/*
+ * Check the MIDR_EL1 of the current CPU for a given model and a range of
+ * variant/revision. See asm/cputype.h for the macros used below.
+ *
+ *	model:		MIDR_CPU_MODEL of CPU
+ *	rv_min:		Minimum of MIDR_CPU_VAR_REV()
+ *	rv_max:		Maximum of MIDR_CPU_VAR_REV()
+ *	res:		Result register.
+ *	tmp1, tmp2, tmp3: Temporary registers
+ *
+ * Corrupts: res, tmp1, tmp2, tmp3
+ * Returns:  0, if the CPU id doesn't match. Non-zero otherwise
+ */
+	.macro	cpu_midr_match model, rv_min, rv_max, res, tmp1, tmp2, tmp3
+	mrs		\res, midr_el1
+	mov_q		\tmp1, (MIDR_REVISION_MASK | MIDR_VARIANT_MASK)
+	mov_q		\tmp2, MIDR_CPU_MODEL_MASK
+	and		\tmp3, \res, \tmp2	// Extract model
+	and		\tmp1, \res, \tmp1	// rev & variant
+	mov_q		\tmp2, \model
+	cmp		\tmp3, \tmp2
+	cset		\res, eq
+	cbz		\res, .Ldone\@		// Model matches ?
+
+	.if (\rv_min != 0)			// Skip min check if rv_min == 0
+	mov_q		\tmp3, \rv_min
+	cmp		\tmp1, \tmp3
+	cset		\res, ge
+	.endif					// \rv_min != 0
+	/* Skip rv_max check if rv_min == rv_max && rv_min != 0 */
+	.if ((\rv_min != \rv_max) || \rv_min == 0)
+	mov_q		\tmp2, \rv_max
+	cmp		\tmp1, \tmp2
+	cset		\tmp2, le
+	and		\res, \res, \tmp2
+	.endif
+.Ldone\@:
+	.endm
+
 #endif	/* __ASM_ASSEMBLER_H */

@@ -78,6 +78,7 @@
 
 #define ARM_CPU_PART_AEM_V8		0xD0F
 #define ARM_CPU_PART_FOUNDATION		0xD00
+#define ARM_CPU_PART_CORTEX_A55		0xD05
 #define ARM_CPU_PART_CORTEX_A57		0xD07
 #define ARM_CPU_PART_CORTEX_A72		0xD08
 #define ARM_CPU_PART_CORTEX_A53		0xD03

@@ -98,6 +99,7 @@
 #define QCOM_CPU_PART_KRYO		0x200
 
 #define MIDR_CORTEX_A53 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A53)
+#define MIDR_CORTEX_A55 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A55)
 #define MIDR_CORTEX_A57 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A57)
 #define MIDR_CORTEX_A72 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72)
 #define MIDR_CORTEX_A73 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A73)

@@ -438,6 +438,11 @@ ENTRY(__cpu_setup)
 	cbz	x9, 2f
 	cmp	x9, #2
 	b.lt	1f
+#ifdef CONFIG_ARM64_ERRATUM_1024718
+	/* Disable hardware DBM on Cortex-A55 r0p0, r0p1 & r1p0 */
+	cpu_midr_match MIDR_CORTEX_A55, MIDR_CPU_VAR_REV(0, 0), MIDR_CPU_VAR_REV(1, 0), x1, x2, x3, x4
+	cbnz	x1, 1f
+#endif
 	orr	x10, x10, #TCR_HD		// hardware Dirty flag update
 1:	orr	x10, x10, #TCR_HA		// hardware Access flag update
 2:

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jann Horn <[email protected]>

commit 0a0b98734479aa5b3c671d5190e86273372cab95 upstream.

Commit 3a4d44b61625 ("ntp: Move adjtimex related compat syscalls to native counterparts") removed the memset() in compat_get_timex(). Since then, the compat adjtimex syscall can invoke do_adjtimex() with an uninitialized ->tai.

If do_adjtimex() doesn't write to ->tai (e.g. because the arguments are invalid), compat_put_timex() then copies the uninitialized ->tai field to userspace.

Fix it by adding the memset() back.

---
 kernel/compat.c |    1 +
 1 file changed, 1 insertion(+)

@@ -34,6 +34,7 @@ int compat_get_timex(struct timex *txc,
 {
 	struct compat_timex tx32;
 
+	memset(txc, 0, sizeof(struct timex));
 	if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
 		return -EFAULT;
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Timur Tabi <[email protected]>

commit ab3dbcf78f60f46d6a0ad63b1f4b690b7a427140 upstream.

If the main loop in linehandle_create() encounters an error, it unwinds completely by freeing all previously requested GPIO descriptors. However, if the error occurs in the beginning of the loop before that GPIO is requested, then the exit code attempts to free a null descriptor. If extrachecks is enabled, gpiod_free() triggers a WARN_ON.

Instead, keep a separate count of legitimate GPIOs so that only those are freed.

---
 drivers/gpio/gpiolib.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

@@ -443,7 +443,7 @@ static int linehandle_create(struct gpio
 	struct gpiohandle_request handlereq;
 	struct linehandle_state *lh;
 	struct file *file;
-	int fd, i, ret;
+	int fd, i, count = 0, ret;
 
 	if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
 		return -EFAULT;

@@ -489,6 +489,7 @@ static int linehandle_create(struct gpio
 		if (ret)
 			goto out_free_descs;
 		lh->descs[i] = desc;
+		count = i;
 
 		if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
 			set_bit(FLAG_ACTIVE_LOW, &desc->flags);

@@ -555,7 +556,7 @@ static int linehandle_create(struct gpio
 out_put_unused_fd:
 	put_unused_fd(fd);
 out_free_descs:
-	for (; i >= 0; i--)
+	for (i = 0; i < count; i++)
 		gpiod_free(lh->descs[i]);
 	kfree(lh->label);
 out_free_lh:

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Govert Overgaauw <[email protected]>

commit f241632fd087d3d9fbd5450f4d8c8604badd8348 upstream.

The unmask function disables all interrupts in a bank when unmasking an interrupt. Only disable the given interrupt.

---
 drivers/gpio/gpio-aspeed.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -375,7 +375,7 @@ static void aspeed_gpio_irq_set_mask(str
 	if (set)
 		reg |= bit;
 	else
-		reg &= bit;
+		reg &= ~bit;
 	iowrite32(reg, addr);
 
 	spin_unlock_irqrestore(&gpio->lock, flags);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Uwe Kleine-König <[email protected]>

commit f001cc351ad3309ec8736c374e90e5a4bc472d41 upstream.

If gpiod_request() fails the cleanup must not call gpiod_free().

---
 drivers/gpio/gpiolib.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -813,7 +813,7 @@ static int lineevent_create(struct gpio_
 	desc = &gdev->descs[offset];
 	ret = gpiod_request(desc, le->label);
 	if (ret)
-		goto out_free_desc;
+		goto out_free_label;
 	le->desc = desc;
 	le->eflags = eflags;
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Johan Hovold <[email protected]>

commit 4bf01ca21e2e0e4561d1a03c48c3d740418702db upstream.

Make sure to free the rfkill device in case registration fails during probe.

---
 net/rfkill/rfkill-gpio.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

@@ -137,13 +137,18 @@ static int rfkill_gpio_probe(struct plat
 
 	ret = rfkill_register(rfkill->rfkill_dev);
 	if (ret < 0)
-		return ret;
+		goto err_destroy;
 
 	platform_set_drvdata(pdev, rfkill);
 
 	dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
 
 	return 0;
+
+err_destroy:
+	rfkill_destroy(rfkill->rfkill_dev);
+
+	return ret;
 }
 
 static int rfkill_gpio_remove(struct platform_device *pdev)

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Hans de Goede <[email protected]>

commit 184add2ca23ce5edcac0ab9c3b9be13f91e7b567 upstream.

Richard Jones has reported that using med_power_with_dipm on a T450s with a Sandisk SD7UB3Q256G1001 SSD (firmware version X2180501) is causing the machine to hang.

Switching the LPM to max_performance fixes this, so it seems that this Sandisk SSD does not handle LPM well.

Note in the past there have been bug-reports about the following Sandisk models not working with min_power, so we may need to extend the quirk list in the future: name - firmware
Sandisk SD6SB2M512G1022I - X210400
Sandisk SD6PP4M-256G-1006 - A200906

---
 drivers/ata/libata-core.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -4539,6 +4539,9 @@ static const struct ata_blacklist_entry
 						ATA_HORKAGE_ZERO_AFTER_TRIM |
 						ATA_HORKAGE_NOLPM, },
 
+	/* Sandisk devices which are known to not handle LPM well */
+	{ "SanDisk SD7UB3Q*G1001",	NULL,	ATA_HORKAGE_NOLPM, },
+
 	/* devices that don't properly handle queued TRIM commands */
 	{ "Micron_M500_*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
 						ATA_HORKAGE_ZERO_AFTER_TRIM, },

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Mikulas Patocka <[email protected]>

commit fc8cec113904a47396bf0a1afc62920d66319d36 upstream.

Use kvfree instead of kfree because the array is allocated with kvmalloc.

---
 drivers/md/dm-integrity.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2439,7 +2439,7 @@ static void dm_integrity_free_journal_sc
 	unsigned i;
 	for (i = 0; i < ic->journal_sections; i++)
 		kvfree(sl[i]);
-	kfree(sl);
+	kvfree(sl);
 }
 
 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic, struct page_list *pl)

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Steven Rostedt (VMware) <[email protected]>

commit dc432c3d7f9bceb3de6f5b44fb9c657c9810ed6d upstream.

The regex match function regex_match_front() in the tracing filter logic, was fixed to test just the pattern length from testing the entire test string. That is, it went from strncmp(str, r->pattern, len) to strcmp(str, r->pattern, r->len).

The issue is that str is not guaranteed to be nul terminated, and if r->len is greater than the length of str, it can access more memory than is allocated.

The solution is to add a simple test if (len < r->len) return 0.

---
 kernel/trace/trace_events_filter.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -338,6 +338,9 @@ static int regex_match_full(char *str, s
 
 static int regex_match_front(char *str, struct regex *r, int len)
 {
+	if (len < r->len)
+		return 0;
+
 	if (strncmp(str, r->pattern, r->len) == 0)
 		return 1;
 	return 0;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Vitaly Wool <[email protected]>

commit 6098d7e136692f9c6e23ae362c62ec822343e4d5 upstream.

Do not try to optimize in-page object layout while the page is under reclaim. This fixes lock-ups on reclaim and improves reclaim performance at the same time.

---
 mm/z3fold.c |   42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

@@ -144,7 +144,8 @@ enum z3fold_page_flags {
 	PAGE_HEADLESS = 0,
 	MIDDLE_CHUNK_MAPPED,
 	NEEDS_COMPACTING,
-	PAGE_STALE
+	PAGE_STALE,
+	UNDER_RECLAIM
 };
 
 /*****************

@@ -173,6 +174,7 @@ static struct z3fold_header *init_z3fold
 	clear_bit(MIDDLE_CHUNK_MAPPED, &page->private);
 	clear_bit(NEEDS_COMPACTING, &page->private);
 	clear_bit(PAGE_STALE, &page->private);
+	clear_bit(UNDER_RECLAIM, &page->private);
 
 	spin_lock_init(&zhdr->page_lock);
 	kref_init(&zhdr->refcount);

@@ -748,6 +750,10 @@ static void z3fold_free(struct z3fold_po
 		atomic64_dec(&pool->pages_nr);
 		return;
 	}
+	if (test_bit(UNDER_RECLAIM, &page->private)) {
+		z3fold_page_unlock(zhdr);
+		return;
+	}
 	if (test_and_set_bit(NEEDS_COMPACTING, &page->private)) {
 		z3fold_page_unlock(zhdr);
 		return;

@@ -832,6 +838,8 @@ static int z3fold_reclaim_page(struct z3
 			kref_get(&zhdr->refcount);
 			list_del_init(&zhdr->buddy);
 			zhdr->cpu = -1;
+			set_bit(UNDER_RECLAIM, &page->private);
+			break;
 		}
 
 		list_del_init(&page->lru);

@@ -879,25 +887,35 @@ static int z3fold_reclaim_page(struct z3
 				goto next;
 		}
 next:
-		spin_lock(&pool->lock);
 		if (test_bit(PAGE_HEADLESS, &page->private)) {
 			if (ret == 0) {
-				spin_unlock(&pool->lock);
 				free_z3fold_page(page);
 				return 0;
 			}
-		} else if (kref_put(&zhdr->refcount, release_z3fold_page)) {
-			atomic64_dec(&pool->pages_nr);
+			spin_lock(&pool->lock);
+			list_add(&page->lru, &pool->lru);
+			spin_unlock(&pool->lock);
+		} else {
+			z3fold_page_lock(zhdr);
+			clear_bit(UNDER_RECLAIM, &page->private);
+			if (kref_put(&zhdr->refcount,
+					release_z3fold_page_locked)) {
+				atomic64_dec(&pool->pages_nr);
+				return 0;
+			}
+			/*
+			 * if we are here, the page is still not completely
+			 * free. Take the global pool lock then to be able
+			 * to add it back to the lru list
+			 */
+			spin_lock(&pool->lock);
+			list_add(&page->lru, &pool->lru);
 			spin_unlock(&pool->lock);
-			return 0;
+			z3fold_page_unlock(zhdr);
 		}
 
-		/*
-		 * Add to the beginning of LRU.
-		 * Pool lock has to be kept here to ensure the page has
-		 * not already been released
-		 */
-		list_add(&page->lru, &pool->lru);
+		/* We started off locked to we need to lock the pool back */
+		spin_lock(&pool->lock);
 	}
 	spin_unlock(&pool->lock);
 	return -EAGAIN;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Pavel Tatashin <[email protected]>

commit 27227c733852f71008e9bf165950bb2edaed3a90 upstream.

Memory hotplug and hotremove operate with per-block granularity. If the machine has a large amount of memory (more than 64G), the size of a memory block can span multiple sections. By mistake, during hotremove we set only the first section to offline state.

The bug was discovered because kernel selftest started to fail:
https://lkml.kernel.org/r/20180423011247.GK5563@yexl-desktop

After commit, "mm/memory_hotplug: optimize probe routine". But, the bug is older than this commit. In this optimization we also added a check for sections to be in a proper state during hotplug operation.

---
 mm/sparse.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -661,7 +661,7 @@ void offline_mem_sections(unsigned long
 	unsigned long pfn;
 
 	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
-		unsigned long section_nr = pfn_to_section_nr(start_pfn);
+		unsigned long section_nr = pfn_to_section_nr(pfn);
 		struct mem_section *ms;
 
 		/*

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: David Rientjes <[email protected]>

commit 27ae357fa82be5ab73b2ef8d39dcb8ca2563483a upstream.

Since exit_mmap() is done without the protection of mm->mmap_sem, it is possible for the oom reaper to concurrently operate on an mm until MMF_OOM_SKIP is set.

This allows munlock_vma_pages_all() to concurrently run while the oom reaper is operating on a vma. Since munlock_vma_pages_range() depends on clearing VM_LOCKED from vm_flags before actually doing the munlock to determine if any other vmas are locking the same memory, the check for VM_LOCKED in the oom reaper is racy.

This is especially noticeable on architectures such as powerpc where clearing a huge pmd requires serialize_against_pte_lookup(). If the pmd is zapped by the oom reaper during follow_page_mask() after the check for pmd_none() is bypassed, this ends up deferencing a NULL ptl or a kernel oops.

Fix this by manually freeing all possible memory from the mm before doing the munlock and then setting MMF_OOM_SKIP. The oom reaper can not run on the mm anymore so the munlock is safe to do in exit_mmap(). It also matches the logic that the oom reaper currently uses for determining when to set MMF_OOM_SKIP itself, so there's no new risk of excessive oom killing.

This issue fixes CVE-2018-1000200.

---
 include/linux/oom.h |    2 +
 mm/mmap.c           |   44 ++++++++++++++++++------------
 mm/oom_kill.c       |   74 ++++++++++++++++++++++++++++------------------------
 3 files changed, 68 insertions(+), 52 deletions(-)

@@ -95,6 +95,8 @@ static inline int check_stable_address_s
 	return 0;
 }
 
+void __oom_reap_task_mm(struct mm_struct *mm);
+
 extern unsigned long oom_badness(struct task_struct *p,
 		struct mem_cgroup *memcg, const nodemask_t *nodemask,
 		unsigned long totalpages);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <[email protected]>

commit 3a15b38fd2efc1d648cb33186bf71e9138c93491 upstream.

rsize/wsize cap should be applied before ceph_osdc_new_request() is called. Otherwise, if the size is limited by the cap instead of the stripe unit, ceph_osdc_new_request() would setup an extent op that is bigger than what dio_get_pages_alloc() would pin and add to the page vector, triggering asserts in the messenger.

---
 fs/ceph/file.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

@@ -873,6 +873,11 @@ ceph_direct_read_write(struct kiocb *ioc
 		size_t start = 0;
 		ssize_t len;
 
+		if (write)
+			size = min_t(u64, size, fsc->mount_options->wsize);
+		else
+			size = min_t(u64, size, fsc->mount_options->rsize);
+
 		vino = ceph_vino(inode);
 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
 					    vino, pos, &size, 0,

@@ -888,11 +893,6 @@ ceph_direct_read_write(struct kiocb *ioc
 			break;
 		}
 
-		if (write)
-			size = min_t(u64, size, fsc->mount_options->wsize);
-		else
-			size = min_t(u64, size, fsc->mount_options->rsize);
-
 		len = size;
 		pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
 		if (IS_ERR(pages)) {

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jimmy Assarsson <[email protected]>

commit 6ee00865ffe4e8c8ba4a68d26db53c7ec09bbb89 upstream.

Increase rx_dropped, if alloc_can_skb() fails, not tx_dropped.

---
 drivers/net/can/usb/kvaser_usb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1179,7 +1179,7 @@ static void kvaser_usb_rx_can_msg(const
 
 	skb = alloc_can_skb(priv->netdev, &cf);
 	if (!skb) {
-		stats->tx_dropped++;
+		stats->rx_dropped++;
 		return;
 	}
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Lukas Wunner <[email protected]>

commit 5cec9425b41dcf834c3d48776900d6acb7e96f38 upstream.

hi3110_get_berr_counter() may run concurrently to the rest of the driver but neglects to acquire the lock protecting access to the SPI device. As a result, it and the rest of the driver may clobber each other's tx and rx buffers.

We became aware of this issue because transmission of packets with "cangen -g 0 -i -x" frequently hung. It turns out that agetty executes ->do_get_berr_counter every few seconds via the following call stack:

    CPU: 2 PID: 1605 Comm: agetty
    [<7f3f7500>] (hi3110_get_berr_counter [hi311x])
    [<7f130204>] (can_fill_info [can_dev])
    [<80693bc0>] (rtnl_fill_ifinfo)
    [<806949ec>] (rtnl_dump_ifinfo)
    [<806b4834>] (netlink_dump)
    [<806b4bc8>] (netlink_recvmsg)
    [<8065f180>] (sock_recvmsg)
    [<80660f90>] (___sys_recvmsg)
    [<80661e7c>] (__sys_recvmsg)
    [<80661ec0>] (SyS_recvmsg)
    [<80108b20>] (ret_fast_syscall+0x0/0x1c)

agetty listens to netlink messages in order to update the login prompt when IP addresses change (if /etc/issue contains \4 or \6 escape codes):
https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=e36deb6424e8

It's a useful feature, though it seems questionable that it causes CAN bit error statistics to be queried.

Be that as it may, if hi3110_get_berr_counter() is invoked while a frame is sent by hi3110_hw_tx(), bogus SPI transfers like the following may occur:

=> 12 00 (hi3110_get_berr_counter() wanted to transmit
EC 00 to query the transmit error counter, but the first byte was overwritten by hi3110_hw_tx_frame())

=> EA 00 3E 80 01 FB (hi3110_hw_tx_frame() wanted to transmit a
frame, but the first byte was overwritten by hi3110_get_berr_counter() because it wanted to query the receive error counter)

This sequence hangs the transmission because the driver believes it has sent a frame and waits for the interrupt signaling completion, but in reality the chip has never sent away the frame since the commands it received were malformed.

Fix by acquiring the SPI lock in hi3110_get_berr_counter().

I've scrutinized the entire driver for further unlocked SPI accesses but found no others.

---
 drivers/net/can/spi/hi311x.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -427,8 +427,10 @@ static int hi3110_get_berr_counter(const
 	struct hi3110_priv *priv = netdev_priv(net);
 	struct spi_device *spi = priv->spi;
 
+	mutex_lock(&priv->hi3110_lock);
 	bec->txerr = hi3110_read(spi, HI3110_READ_TEC);
 	bec->rxerr = hi3110_read(spi, HI3110_READ_REC);
+	mutex_unlock(&priv->hi3110_lock);
 
 	return 0;
 }

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Lukas Wunner <[email protected]>

commit 32bee8f48fa048a3198109de50e51c092507ff52 upstream.

When sending packets as fast as possible using "cangen -g 0 -i -x", the HI-3110 occasionally latches the interrupt pin high on completion of a packet, but doesn't set the TXCPLT bit in the INTF register. The INTF register contains 0x00 as if no interrupt has occurred. Even waiting for a few milliseconds after the interrupt doesn't help.

Work around this apparent erratum by instead checking the TXMTY bit in the STATF register ("TX FIFO empty"). We know that we've queued up a packet for transmission if priv->tx_len is nonzero. If the TX FIFO is empty, transmission of that packet must have completed.

Note that this is congruent with our handling of received packets, which likewise gleans from the STATF register whether a packet is waiting in the RX FIFO, instead of looking at the INTF register.

---
 drivers/net/can/spi/hi311x.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

@@ -91,6 +91,7 @@
 #define HI3110_STAT_BUSOFF BIT(2)
 #define HI3110_STAT_ERRP BIT(3)
 #define HI3110_STAT_ERRW BIT(4)
+#define HI3110_STAT_TXMTY BIT(7)
 
 #define HI3110_BTR0_SJW_SHIFT 6
 #define HI3110_BTR0_BRP_SHIFT 0

@@ -737,10 +738,7 @@ static irqreturn_t hi3110_can_ist(int ir
 			}
 		}
 
-		if (intf == 0)
-			break;
-
-		if (intf & HI3110_INT_TXCPLT) {
+		if (priv->tx_len && statf & HI3110_STAT_TXMTY) {
 			net->stats.tx_packets++;
 			net->stats.tx_bytes += priv->tx_len - 1;
 			can_led_event(net, CAN_LED_EVENT_TX);

@@ -750,6 +748,9 @@ static irqreturn_t hi3110_can_ist(int ir
 			}
 			netif_wake_queue(net);
 		}
+
+		if (intf == 0)
+			break;
 	}
 	mutex_unlock(&priv->hi3110_lock);
 	return IRQ_HANDLED;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Boris Brezillon <[email protected]>

commit 9a0e9802217291e54c4dd1fc5462f189a4be14ec upstream.

When using uni-planar formats (like RGB), the scaling parameters are stored in plane 0, not plane 1.

---
 drivers/gpu/drm/vc4/vc4_plane.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -535,7 +535,7 @@ static int vc4_plane_mode_set(struct drm
 	 * the scl fields here.
 	 */
 	if (num_planes == 1) {
-		scl0 = vc4_get_scl_field(state, 1);
+		scl0 = vc4_get_scl_field(state, 0);
 		scl1 = scl0;
 	} else {
 		scl0 = vc4_get_scl_field(state, 1);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Florent Flament <[email protected]>

commit e8f48f96db7e482995743f461b3e8a5c1a102533 upstream.

Fix [drm:intel_enable_lvds] *ERROR* timed out waiting for panel to power on in kernel log at boot time.

Toshiba Satellite Z930 laptops needs between 1 and 2 seconds to power on its screen during Intel i915 DRM initialization. This currently results in a [drm:intel_enable_lvds] *ERROR* timed out waiting for panel to power on message appearing in the kernel log during boot time and when stopping the machine.

This change increases the timeout of the intel_enable_lvds function from 1 to 5 seconds, letting enough time for the Satellite 930 LCD screen to power on, and suppressing the error message from the kernel log.

This patch has been successfully tested on Linux 4.14 running on a Toshiba Satellite Z930.

[vsyrjala: bump the timeout from 2 to 5 seconds to match the DP
code and properly cover the max hw timeout of ~4 seconds, and drop the comment about the specific machine since this is not a particulary surprising issue, nor specific to that one machine]

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103414
References: https://bugzilla.kernel.org/show_bug.cgi?id=57591

---
 drivers/gpu/drm/i915/intel_lvds.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -317,7 +317,8 @@ static void intel_enable_lvds(struct int
 
 	I915_WRITE(PP_CONTROL(0), I915_READ(PP_CONTROL(0)) | PANEL_POWER_ON);
 	POSTING_READ(lvds_encoder->reg);
-	if (intel_wait_for_register(dev_priv, PP_STATUS(0), PP_ON, PP_ON, 1000))
+
+	if (intel_wait_for_register(dev_priv, PP_STATUS(0), PP_ON, PP_ON, 5000))
 		DRM_ERROR("timed out waiting for panel to power on\n");
 
 	intel_panel_enable_backlight(pipe_config, conn_state);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Lyude Paul <[email protected]>

commit 352672db857290ab5b0e2b6a99c414f92bee024c upstream.

Currently; we're grabbing all of the modesetting locks before adding MST connectors to fbdev. This isn't actually necessary, and causes a deadlock as well:

======================================================
WARNING: possible circular locking dependency detected
4.17.0-rc3Lyude-Test+ #1 Tainted: G O
------------------------------------------------------
kworker/1:0/18 is trying to acquire lock:
00000000c832f62d (&helper->lock){+.+.}, at: drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]

but task is already holding lock:
00000000942e28e2 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_backoff+0x8e/0x1c0 [drm]

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #3 (crtc_ww_class_mutex){+.+.}:

       ww_mutex_lock+0x43/0x80
       drm_modeset_lock+0x71/0x130 [drm]
       drm_helper_probe_single_connector_modes+0x7d/0x6b0 [drm_kms_helper]
       drm_setup_crtcs+0x15e/0xc90 [drm_kms_helper]
       __drm_fb_helper_initial_config_and_unlock+0x29/0x480 [drm_kms_helper]
       nouveau_fbcon_init+0x138/0x1a0 [nouveau]
       nouveau_drm_load+0x173/0x7e0 [nouveau]
       drm_dev_register+0x134/0x1c0 [drm]
       drm_get_pci_dev+0x8e/0x160 [drm]
       nouveau_drm_probe+0x1a9/0x230 [nouveau]
       pci_device_probe+0xcd/0x150
       driver_probe_device+0x30b/0x480
       __driver_attach+0xbc/0xe0
       bus_for_each_dev+0x67/0x90
       bus_add_driver+0x164/0x260
       driver_register+0x57/0xc0
       do_one_initcall+0x4d/0x323
       do_init_module+0x5b/0x1f8
       load_module+0x20e5/0x2ac0
       __do_sys_finit_module+0xb7/0xd0
       do_syscall_64+0x60/0x1b0
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #2 (crtc_ww_class_acquire){+.+.}:

       drm_helper_probe_single_connector_modes+0x58/0x6b0 [drm_kms_helper]
       drm_setup_crtcs+0x15e/0xc90 [drm_kms_helper]
       __drm_fb_helper_initial_config_and_unlock+0x29/0x480 [drm_kms_helper]
       nouveau_fbcon_init+0x138/0x1a0 [nouveau]
       nouveau_drm_load+0x173/0x7e0 [nouveau]
       drm_dev_register+0x134/0x1c0 [drm]
       drm_get_pci_dev+0x8e/0x160 [drm]
       nouveau_drm_probe+0x1a9/0x230 [nouveau]
       pci_device_probe+0xcd/0x150
       driver_probe_device+0x30b/0x480
       __driver_attach+0xbc/0xe0
       bus_for_each_dev+0x67/0x90
       bus_add_driver+0x164/0x260
       driver_register+0x57/0xc0
       do_one_initcall+0x4d/0x323
       do_init_module+0x5b/0x1f8
       load_module+0x20e5/0x2ac0
       __do_sys_finit_module+0xb7/0xd0
       do_syscall_64+0x60/0x1b0
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (&dev->mode_config.mutex){+.+.}:

       drm_setup_crtcs+0x10c/0xc90 [drm_kms_helper]
       __drm_fb_helper_initial_config_and_unlock+0x29/0x480 [drm_kms_helper]
       nouveau_fbcon_init+0x138/0x1a0 [nouveau]
       nouveau_drm_load+0x173/0x7e0 [nouveau]
       drm_dev_register+0x134/0x1c0 [drm]
       drm_get_pci_dev+0x8e/0x160 [drm]
       nouveau_drm_probe+0x1a9/0x230 [nouveau]
       pci_device_probe+0xcd/0x150
       driver_probe_device+0x30b/0x480
       __driver_attach+0xbc/0xe0
       bus_for_each_dev+0x67/0x90
       bus_add_driver+0x164/0x260
       driver_register+0x57/0xc0
       do_one_initcall+0x4d/0x323
       do_init_module+0x5b/0x1f8
       load_module+0x20e5/0x2ac0
       __do_sys_finit_module+0xb7/0xd0
       do_syscall_64+0x60/0x1b0
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&helper->lock){+.+.}:

       __mutex_lock+0x70/0x9d0
       drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]
       nv50_mstm_register_connector+0x2c/0x50 [nouveau]
       drm_dp_add_port+0x2f5/0x420 [drm_kms_helper]
       drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper]
       drm_dp_add_port+0x33f/0x420 [drm_kms_helper]
       drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper]
       drm_dp_check_and_send_link_address+0x87/0xd0 [drm_kms_helper]
       drm_dp_mst_link_probe_work+0x4d/0x80 [drm_kms_helper]
       process_one_work+0x20d/0x650
       worker_thread+0x3a/0x390
       kthread+0x11e/0x140
       ret_from_fork+0x3a/0x50

other info that might help us debug this:

Chain exists of:
  &helper->lock --> crtc_ww_class_acquire --> crtc_ww_class_mutex
 Possible unsafe locking scenario:
       CPU0                    CPU1
       ----                    ----
  lock(crtc_ww_class_mutex);
                               lock(crtc_ww_class_acquire);
                               lock(crtc_ww_class_mutex);
  lock(&helper->lock);

*** DEADLOCK ***
5 locks held by kworker/1:0/18:
#0: 000000004a05cd50 ((wq_completion)"events_long"){+.+.}, at: process_one_work+0x187/0x650 #1: 00000000601c11d1 ((work_completion)(&mgr->work)){+.+.}, at: process_one_work+0x187/0x650 #2: 00000000586ca0df (&dev->mode_config.mutex){+.+.}, at: drm_modeset_lock_all+0x3a/0x1b0 [drm] #3: 00000000d3ca0ffa (crtc_ww_class_acquire){+.+.}, at: drm_modeset_lock_all+0x44/0x1b0 [drm] #4: 00000000942e28e2 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_backoff+0x8e/0x1c0 [drm]

stack backtrace:
CPU: 1 PID: 18 Comm: kworker/1:0 Tainted: G           O      4.17.0-rc3Lyude-Test+ #1
Hardware name: Gateway FX6840/FX6840, BIOS P01-A3         05/17/2010
Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper]
Call Trace:
 dump_stack+0x85/0xcb
 print_circular_bug.isra.38+0x1ce/0x1db
 __lock_acquire+0x128f/0x1350
 ? lock_acquire+0x9f/0x200
 ? lock_acquire+0x9f/0x200
 ? __ww_mutex_lock.constprop.13+0x8f/0x1000
 lock_acquire+0x9f/0x200
 ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]
 ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]
 __mutex_lock+0x70/0x9d0
 ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]
 ? ww_mutex_lock+0x43/0x80
 ? _cond_resched+0x15/0x30
 ? ww_mutex_lock+0x43/0x80
 ? drm_modeset_lock+0xb2/0x130 [drm]
 ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]
 drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper]
 nv50_mstm_register_connector+0x2c/0x50 [nouveau]
 drm_dp_add_port+0x2f5/0x420 [drm_kms_helper]
 ? mark_held_locks+0x50/0x80
 ? kfree+0xcf/0x2a0
 ? drm_dp_check_mstb_guid+0xd6/0x120 [drm_kms_helper]
 ? trace_hardirqs_on_caller+0xed/0x180
 ? drm_dp_check_mstb_guid+0xd6/0x120 [drm_kms_helper]
 drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper]
 drm_dp_add_port+0x33f/0x420 [drm_kms_helper]
 ? nouveau_connector_aux_xfer+0x7c/0xb0 [nouveau]
 ? find_held_lock+0x2d/0x90
 ? drm_dp_dpcd_access+0xd9/0xf0 [drm_kms_helper]
 ? __mutex_unlock_slowpath+0x3b/0x280
 ? drm_dp_dpcd_access+0xd9/0xf0 [drm_kms_helper]
 drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper]
 drm_dp_check_and_send_link_address+0x87/0xd0 [drm_kms_helper]
 drm_dp_mst_link_probe_work+0x4d/0x80 [drm_kms_helper]
 process_one_work+0x20d/0x650
 worker_thread+0x3a/0x390
 ? process_one_work+0x650/0x650
 kthread+0x11e/0x140
 ? kthread_create_worker_on_cpu+0x50/0x50
 ret_from_fork+0x3a/0x50

Taking example from i915, the only time we need to hold any modesetting locks is when changing the port on the mstc, and in that case we only need to hold the connection mutex.

---
 drivers/gpu/drm/nouveau/nv50_display.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

@@ -3216,10 +3216,11 @@ nv50_mstm_destroy_connector(struct drm_d
 
 	drm_connector_unregister(&mstc->connector);
 
-	drm_modeset_lock_all(drm->dev);
 	drm_fb_helper_remove_one_connector(&drm->fbcon->helper, &mstc->connector);
+
+	drm_modeset_lock(&drm->dev->mode_config.connection_mutex, NULL);
 	mstc->port = NULL;
-	drm_modeset_unlock_all(drm->dev);
+	drm_modeset_unlock(&drm->dev->mode_config.connection_mutex);
 
 	drm_connector_unreference(&mstc->connector);
 }

@@ -3229,9 +3230,7 @@ nv50_mstm_register_connector(struct drm_
 {
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 
-	drm_modeset_lock_all(drm->dev);
 	drm_fb_helper_add_one_connector(&drm->fbcon->helper, connector);
-	drm_modeset_unlock_all(drm->dev);
 
 	drm_connector_register(connector);
 }

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Ville Syrjälä <[email protected]>

commit f0b408eebc993310bea3f2daae286c40bd3f063b upstream.

Clear the old_state and new_state pointers for every object in drm_atomic_state_default_clear(). Otherwise drm_atomic_get_{new,old}_*_state() will hand out stale pointers to anyone who hasn't first confirmed that the object is in fact part of the current atomic transcation, if they are called after we've done the ww backoff dance while hanging on to the same drm_atomic_state.

For example, handle_conflicting_encoders() looks like it could hit this since it iterates the full connector list and just calls drm_atomic_get_new_connector_state() for each.

And I believe we have now witnessed this happening at least once in i915 check_digital_port_conflicts(). Commit 8b69449d2663 ("drm/i915:
Remove last references to drm_atomic_get_existing* macros") changed the safe drm_atomic_get_existing_connector_state() to the unsafe drm_atomic_get_new_connector_state(), which opened the doors for this particular bug there as well.

v2: Split private objs out to a separate patch (Daniel)

---
 drivers/gpu/drm/drm_atomic.c |    6 ++++++
 1 file changed, 6 insertions(+)

@@ -151,6 +151,8 @@ void drm_atomic_state_default_clear(stru
 						       state->connectors[i].state);
 		state->connectors[i].ptr = NULL;
 		state->connectors[i].state = NULL;
+		state->connectors[i].old_state = NULL;
+		state->connectors[i].new_state = NULL;
 		drm_connector_put(connector);
 	}
 

@@ -172,6 +174,8 @@ void drm_atomic_state_default_clear(stru
 		state->crtcs[i].commit = NULL;
 		state->crtcs[i].ptr = NULL;
 		state->crtcs[i].state = NULL;
+		state->crtcs[i].old_state = NULL;
+		state->crtcs[i].new_state = NULL;
 	}
 
 	for (i = 0; i < config->num_total_plane; i++) {

@@ -184,6 +188,8 @@ void drm_atomic_state_default_clear(stru
 						   state->planes[i].state);
 		state->planes[i].ptr = NULL;
 		state->planes[i].state = NULL;
+		state->planes[i].old_state = NULL;
+		state->planes[i].new_state = NULL;
 	}
 
 	for (i = 0; i < state->num_private_objs; i++) {

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Ville Syrjälä <[email protected]>

commit b5cb2e5a1f64d882a155add7522247ab0523051e upstream.

Clear the old_state and new_state pointers for private objects in drm_atomic_state_default_clear(). We don't actually have functions to get the new/old state for private objects so getting access to the potentially stale pointers requires a bit more manual labour than for other object types. But let's clear the pointers for private objects as well, if only to avoid future surprises when someone decides to add the functions to get at them.

v2: Split private objs to a separate patch (Daniel)

---
 drivers/gpu/drm/drm_atomic.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -202,6 +202,8 @@ void drm_atomic_state_default_clear(stru
 						 state->private_objs[i].state);
 		state->private_objs[i].ptr = NULL;
 		state->private_objs[i].state = NULL;
+		state->private_objs[i].old_state = NULL;
+		state->private_objs[i].new_state = NULL;
 	}
 	state->num_private_objs = 0;
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Gustavo A. R. Silva <[email protected]>

commit acf784bd0ce257fe43da7ca266f7a10b837479d2 upstream.

ioc_data.dev_num can be controlled by user-space, hence leading to a potential exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:
net/atm/lec.c:702 lec_vcc_attach() warn: potential spectre issue 'dev_lec'

Fix this by sanitizing ioc_data.dev_num before using it to index dev_lec. Also, notice that there is another instance in which array dev_lec is being indexed using ioc_data.dev_num at line 705:
lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),

Notice that given that speculation windows are large, the policy is to kill the speculation on the first load and not worry if it can be completed with a dependent load/store [1].

[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2

---
 net/atm/lec.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

@@ -41,6 +41,9 @@ static unsigned char bridge_ula_lec[] =
 #include <linux/module.h>
 #include <linux/init.h>
 
+/* Hardening for Spectre-v1 */
+#include <linux/nospec.h>
+
 #include "lec.h"
 #include "lec_arpc.h"
 #include "resources.h"

@@ -687,8 +690,10 @@ static int lec_vcc_attach(struct atm_vcc
 	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
 	if (bytes_left != 0)
 		pr_info("copy from user failed for %d bytes\n", bytes_left);
-	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
-	    !dev_lec[ioc_data.dev_num])
+	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
+		return -EINVAL;
+	ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
+	if (!dev_lec[ioc_data.dev_num])
 		return -EINVAL;
 	vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
 	if (!vpriv)

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Gustavo A. R. Silva <[email protected]>

commit 2be147f7459db5bbf292e0a6f135037b55e20b39 upstream.

pool can be indirectly controlled by user-space, hence leading to a potential exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:

drivers/atm/zatm.c:1462 zatm_ioctl() warn: potential spectre issue 'zatm_dev->pool_info' (local cap)

Fix this by sanitizing pool before using it to index zatm_dev->pool_info

Notice that given that speculation windows are large, the policy is to kill the speculation on the first load and not worry if it can be completed with a dependent load/store [1].

[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2

---
 drivers/atm/zatm.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -28,6 +28,7 @@
 #include <asm/io.h>
 #include <linux/atomic.h>
 #include <linux/uaccess.h>
+#include <linux/nospec.h>
 
 #include "uPD98401.h"
 #include "uPD98402.h"

@@ -1458,6 +1459,8 @@ static int zatm_ioctl(struct atm_dev *de
 					return -EFAULT;
 				if (pool < 0 || pool > ZATM_LAST_POOL)
 					return -EINVAL;
+				pool = array_index_nospec(pool,
+							  ZATM_LAST_POOL + 1);
 				spin_lock_irqsave(&zatm_dev->lock, flags);
 				info = zatm_dev->pool_info[pool];
 				if (cmd == ZATM_GETPOOLZ) {

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Kai Heng Feng <[email protected]>

commit 8feaec33b9868582654cd3d5355225dcb79aeca6 upstream.

USB controller ASM1042 stops working after commit de3ef1eb1cd0 (PM /
core: Drop run_wake flag from struct dev_pm_info).

The device in question is not power managed by platform firmware, furthermore, it only supports PME# from D3cold:
Capabilities: [78] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0-,D1-,D2-,D3hot-,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-

Before commit de3ef1eb1cd0, the device never gets runtime suspended. After that commit, the device gets runtime suspended to D3hot, which can not generate any PME#.

usb_hcd_pci_probe() unconditionally calls device_wakeup_enable(), hence device_can_wakeup() in pci_dev_run_wake() always returns true.

So pci_dev_run_wake() needs to check PME wakeup capability as its first condition.

In addition, change wakeup flag passed to pci_target_state() from false to true, because we want to find the deepest state different from D3cold that the device can still generate PME#. In this case, it's D0 for the device in question.

---
 drivers/pci/pci.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -2120,16 +2120,16 @@ bool pci_dev_run_wake(struct pci_dev *de
 {
 	struct pci_bus *bus = dev->bus;
 
-	if (device_can_wakeup(&dev->dev))
-		return true;
-
 	if (!dev->pme_support)
 		return false;
 
 	/* PME-capable in principle, but not from the target power state */
-	if (!pci_pme_capable(dev, pci_target_state(dev, false)))
+	if (!pci_pme_capable(dev, pci_target_state(dev, true)))
 		return false;
 
+	if (device_can_wakeup(&dev->dev))
+		return true;
+
 	while (bus->parent) {
 		struct pci_dev *bridge = bus->self;
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Rafael J. Wysocki <[email protected]>

commit cfcadfaad7251d8b640713724b388164d75465b2 upstream.

Commit 0847684cfc5f0 (PCI / PM: Simplify device wakeup settings code) went too far and dropped the device_may_wakeup() check from pci_enable_wake() which causes wakeup to be enabled during system suspend, hibernation or shutdown for some PCI devices that are not allowed by user space to wake up the system from sleep (or power off).

As a result of this, excessive power is drawn by some of the affected systems while in sleep states or off.

Restore the device_may_wakeup() check in pci_enable_wake(), but make sure that the PCI bus type's runtime suspend callback will not call device_may_wakeup() which is about system wakeup from sleep and not about device wakeup from runtime suspend.

---
 drivers/pci/pci.c |   29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

@@ -1892,7 +1892,7 @@ void pci_pme_active(struct pci_dev *dev,
 EXPORT_SYMBOL(pci_pme_active);
 
 /**
- * pci_enable_wake - enable PCI device as wakeup event source
+ * __pci_enable_wake - enable PCI device as wakeup event source
  * @dev: PCI device affected
  * @state: PCI state from which device will issue wakeup events
  * @enable: True to enable event generation; false to disable

@@ -1910,7 +1910,7 @@ EXPORT_SYMBOL(pci_pme_active);
  * Error code depending on the platform is returned if both the platform and
  * the native mechanism fail to enable the generation of wake-up events
  */
-int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
+static int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
 {
 	int ret = 0;
 

@@ -1951,6 +1951,23 @@ int pci_enable_wake(struct pci_dev *dev,
 
 	return ret;
 }
+
+/**
+ * pci_enable_wake - change wakeup settings for a PCI device
+ * @pci_dev: Target device
+ * @state: PCI state from which device will issue wakeup events
+ * @enable: Whether or not to enable event generation
+ *
+ * If @enable is set, check device_may_wakeup() for the device before calling
+ * __pci_enable_wake() for it.
+ */
+int pci_enable_wake(struct pci_dev *pci_dev, pci_power_t state, bool enable)
+{
+	if (enable && !device_may_wakeup(&pci_dev->dev))
+		return -EINVAL;
+
+	return __pci_enable_wake(pci_dev, state, enable);
+}
 EXPORT_SYMBOL(pci_enable_wake);
 
 /**

@@ -1963,9 +1980,9 @@ EXPORT_SYMBOL(pci_enable_wake);
  * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
  * ordering constraints.
  *
- * This function only returns error code if the device is not capable of
- * generating PME# from both D3_hot and D3_cold, and the platform is unable to
- * enable wake-up power for it.
+ * This function only returns error code if the device is not allowed to wake
+ * up the system from sleep or it is not capable of generating PME# from both
+ * D3_hot and D3_cold and the platform is unable to enable wake-up power for it.
  */
 int pci_wake_from_d3(struct pci_dev *dev, bool enable)
 {

@@ -2096,7 +2113,7 @@ int pci_finish_runtime_suspend(struct pc
 
 	dev->runtime_d3cold = target_state == PCI_D3cold;
 
-	pci_enable_wake(dev, target_state, pci_dev_run_wake(dev));
+	__pci_enable_wake(dev, target_state, pci_dev_run_wake(dev));
 
 	error = pci_set_power_state(dev, target_state);
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Rafael J. Wysocki <[email protected]>

commit 97739501f207efe33145b918817f305b822987f8 upstream.

If the next_freq field of struct sugov_policy is set to UINT_MAX, it shouldn't be used for updating the CPU frequency (this is a special "invalid" value), but after commit b7eaf1aab9f8 (cpufreq:
schedutil: Avoid reducing frequency of busy CPUs prematurely) it may be passed as the new frequency to sugov_update_commit() in sugov_update_single().

Fix that by adding an extra check for the special UINT_MAX value of next_freq to sugov_update_single().

---
 kernel/sched/cpufreq_schedutil.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -282,7 +282,8 @@ static void sugov_update_single(struct u
 		 * Do not reduce the frequency if the CPU has not been idle
 		 * recently, as the reduction is likely to be premature then.
 		 */
-		if (busy && next_f < sg_policy->next_freq) {
+		if (busy && next_f < sg_policy->next_freq &&
+		    sg_policy->next_freq != UINT_MAX) {
 			next_f = sg_policy->next_freq;
 
 			/* Reset cached freq as next_freq has changed */

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Hans de Goede <[email protected]>

commit 544a591668813583021474fa5c7ff4942244d654 upstream.

Commit f44cb4b19ed4 ("Bluetooth: btusb: Fix quirk for Atheros 1525/QCA6174") is causing bluetooth to no longer work for several people, see: https://bugzilla.redhat.com/show_bug.cgi?id=1568911

So lets revert it for now and try to find another solution for devices which need the modified quirk.

---
 drivers/bluetooth/btusb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -235,6 +235,7 @@ static const struct usb_device_id blackl
 	{ USB_DEVICE(0x0930, 0x0227), .driver_info = BTUSB_ATH3012 },
 	{ USB_DEVICE(0x0b05, 0x17d0), .driver_info = BTUSB_ATH3012 },
 	{ USB_DEVICE(0x0cf3, 0x0036), .driver_info = BTUSB_ATH3012 },
+	{ USB_DEVICE(0x0cf3, 0x3004), .driver_info = BTUSB_ATH3012 },
 	{ USB_DEVICE(0x0cf3, 0x3008), .driver_info = BTUSB_ATH3012 },
 	{ USB_DEVICE(0x0cf3, 0x311d), .driver_info = BTUSB_ATH3012 },
 	{ USB_DEVICE(0x0cf3, 0x311e), .driver_info = BTUSB_ATH3012 },

@@ -267,7 +268,6 @@ static const struct usb_device_id blackl
 	{ USB_DEVICE(0x0489, 0xe03c), .driver_info = BTUSB_ATH3012 },
 
 	/* QCA ROME chipset */
-	{ USB_DEVICE(0x0cf3, 0x3004), .driver_info = BTUSB_QCA_ROME },
 	{ USB_DEVICE(0x0cf3, 0xe007), .driver_info = BTUSB_QCA_ROME },
 	{ USB_DEVICE(0x0cf3, 0xe009), .driver_info = BTUSB_QCA_ROME },
 	{ USB_DEVICE(0x0cf3, 0xe300), .driver_info = BTUSB_QCA_ROME },

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Hans de Goede <[email protected]>

commit 596b07a9a22656493726edf1739569102bd3e136 upstream.

The Dell XPS 13 9360 uses a QCA Rome chip which needs to be reset (and have its firmware reloaded) for bluetooth to work after suspend/resume.

---
 drivers/bluetooth/btusb.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -395,6 +395,13 @@ static const struct dmi_system_id btusb_
 			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 3060"),
 		},
 	},
+	{
+		/* Dell XPS 9360 (QCA ROME device 0cf3:e300) */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
+		},
+	},
 	{}
 };
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Hans de Goede <[email protected]>

commit fc54910280eb38bde923cdf0898e74687d8e6989 upstream.

Jeremy Cline correctly points out in rhbz#1514836 that a device where the QCA rome chipset needs the USB_QUIRK_RESET_RESUME quirk, may also ship with a different wifi/bt chipset in some configurations.

If that is the case then we are needlessly penalizing those other chipsets with a reset-resume quirk, typically causing 0.4W extra power use because this disables runtime-pm.

This commit moves the DMI table check to a btusb_check_needs_reset_resume() helper (so that we can easily also call it for other chipsets) and calls this new helper only for QCA_ROME chipsets for now.

---
 drivers/bluetooth/btusb.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

@@ -2902,6 +2902,12 @@ static int btusb_config_oob_wake(struct
 }
 #endif
 
+static void btusb_check_needs_reset_resume(struct usb_interface *intf)
+{
+	if (dmi_check_system(btusb_needs_reset_resume_table))
+		interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
+}
+
 static int btusb_probe(struct usb_interface *intf,
 		       const struct usb_device_id *id)
 {

@@ -3037,9 +3043,6 @@ static int btusb_probe(struct usb_interf
 	hdev->send   = btusb_send_frame;
 	hdev->notify = btusb_notify;
 
-	if (dmi_check_system(btusb_needs_reset_resume_table))
-		interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
-
 #ifdef CONFIG_PM
 	err = btusb_config_oob_wake(hdev);
 	if (err)

@@ -3177,6 +3180,7 @@ static int btusb_probe(struct usb_interf
 			hdev->setup = btusb_setup_csr;
 
 		set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
+		btusb_check_needs_reset_resume(intf);
 	}
 
 	if (id->driver_info & BTUSB_SNIFFER) {

+ Guenter

FYI, this backport is wrong. See below.

Turns out 4.16.y has the same problem. Maybe git got confused because mainline also has

	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);

in the BTUSB_QCA_ROME section. This is missing in 4.14.y and 4.16.y.

Guenter

Ah, thanks for catching this, I'll go fix this up. Looks like patch got confused by the use of set_bit() here and fuzzed it into this location instead.

greg k-h

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <[email protected]>

commit 88fc6f73fddf64eb507b04f7b2bd01d7291db514 upstream.

When thermal sensor is not yet enabled, reading temperature might return random value. This might even result in stopping system booting when such temperature is higher than the critical value. Fix this by checking if TMU has been actually enabled before reading the temperature.

This change fixes booting of Exynos4210-based board with TMU enabled (for example Samsung Trats board), which was broken since v4.4 kernel release.

---
 drivers/thermal/samsung/exynos_tmu.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

@@ -185,6 +185,7 @@
  * @regulator: pointer to the TMU regulator structure.
  * @reg_conf: pointer to structure to register with core thermal.
  * @ntrip: number of supported trip points.
+ * @enabled: current status of TMU device
  * @tmu_initialize: SoC specific TMU initialization method
  * @tmu_control: SoC specific TMU control method
  * @tmu_read: SoC specific TMU temperature read method

@@ -205,6 +206,7 @@ struct exynos_tmu_data {
 	struct regulator *regulator;
 	struct thermal_zone_device *tzd;
 	unsigned int ntrip;
+	bool enabled;
 
 	int (*tmu_initialize)(struct platform_device *pdev);
 	void (*tmu_control)(struct platform_device *pdev, bool on);

@@ -398,6 +400,7 @@ static void exynos_tmu_control(struct pl
 	mutex_lock(&data->lock);
 	clk_enable(data->clk);
 	data->tmu_control(pdev, on);
+	data->enabled = on;
 	clk_disable(data->clk);
 	mutex_unlock(&data->lock);
 }

@@ -890,7 +893,7 @@ static int exynos_get_temp(void *p, int
 {
 	struct exynos_tmu_data *data = p;
 
-	if (!data || !data->tmu_read)
+	if (!data || !data->tmu_read || !data->enabled)
 		return -EINVAL;
 
 	mutex_lock(&data->lock);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <[email protected]>

commit c8da6cdef57b459ac0fd5d9d348f8460a575ae90 upstream.

tmu_read() in case of Exynos4210 might return error for out of bound values. Current code ignores such value, what leads to reporting critical temperature value. Add proper error code propagation to exynos_get_temp() function.

---
 drivers/thermal/samsung/exynos_tmu.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

@@ -892,6 +892,7 @@ static void exynos7_tmu_control(struct p
 static int exynos_get_temp(void *p, int *temp)
 {
 	struct exynos_tmu_data *data = p;
+	int value, ret = 0;
 
 	if (!data || !data->tmu_read || !data->enabled)
 		return -EINVAL;

@@ -899,12 +900,16 @@ static int exynos_get_temp(void *p, int
 	mutex_lock(&data->lock);
 	clk_enable(data->clk);
 
-	*temp = code_to_temp(data, data->tmu_read(data)) * MCELSIUS;
+	value = data->tmu_read(data);
+	if (value < 0)
+		ret = value;
+	else
+		*temp = code_to_temp(data, value) * MCELSIUS;
 
 	clk_disable(data->clk);
 	mutex_unlock(&data->lock);
 
-	return 0;
+	return ret;
 }
 
 #ifdef CONFIG_THERMAL_EMULATION

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jens Axboe <[email protected]>

commit 9abd68ef454c824bfd18629033367b4382b5f390 upstream.

Some P3100 drives have a bug where they think WRRU (weighted round robin) is always enabled, even though the host doesn't set it. Since they think it's enabled, they also look at the submission queue creation priority. We used to set that to MEDIUM by default, but that was removed in commit 81c1cd98351b. This causes various issues on that drive. Add a quirk to still set MEDIUM priority for that controller.

---
 drivers/nvme/host/nvme.h |    5 +++++
 drivers/nvme/host/pci.c  |   12 +++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

@@ -80,6 +80,11 @@ enum nvme_quirks {
 	 * Supports the LighNVM command set if indicated in vs[1].
 	 */
 	NVME_QUIRK_LIGHTNVM			= (1 << 6),
+
+	/*
+	 * Set MEDIUM priority on SQ creation
+	 */
+	NVME_QUIRK_MEDIUM_PRIO_SQ		= (1 << 7),
 };
 
 /*

@@ -947,10 +947,19 @@ static int adapter_alloc_cq(struct nvme_
 static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
 						struct nvme_queue *nvmeq)
 {
+	struct nvme_ctrl *ctrl = &dev->ctrl;
 	struct nvme_command c;
 	int flags = NVME_QUEUE_PHYS_CONTIG;
 
 	/*
+	 * Some drives have a bug that auto-enables WRRU if MEDIUM isn't
+	 * set. Since URGENT priority is zeroes, it makes all queues
+	 * URGENT.
+	 */
+	if (ctrl->quirks & NVME_QUIRK_MEDIUM_PRIO_SQ)
+		flags |= NVME_SQ_PRIO_MEDIUM;
+
+	/*
 	 * Note: we (ab)use the fact the the prp fields survive if no data
 	 * is attached to the request.
 	 */

@@ -2523,7 +2532,8 @@ static const struct pci_device_id nvme_i
 		.driver_data = NVME_QUIRK_STRIPE_SIZE |
 				NVME_QUIRK_DEALLOCATE_ZEROES, },
 	{ PCI_VDEVICE(INTEL, 0xf1a5),	/* Intel 600P/P3100 */
-		.driver_data = NVME_QUIRK_NO_DEEPEST_PS },
+		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
+				NVME_QUIRK_MEDIUM_PRIO_SQ },
 	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
 		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },
 	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Steve French <[email protected]>

commit 6e70c267e68d77679534dcf4aaf84e66f2cf1425 upstream.

As with NFS, which ignores sync on directory handles, fsync on a directory handle is a noop for CIFS/SMB3. Do not return an error on it. It breaks some database apps otherwise.

---
 fs/cifs/cifsfs.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

@@ -1045,6 +1045,18 @@ out:
 	return rc;
 }
 
+/*
+ * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
+ * is a dummy operation.
+ */
+static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+	cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
+		 file, datasync);
+
+	return 0;
+}
+
 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
 				struct file *dst_file, loff_t destoff,
 				size_t len, unsigned int flags)

@@ -1173,6 +1185,7 @@ const struct file_operations cifs_dir_op
 	.copy_file_range = cifs_copy_file_range,
 	.clone_file_range = cifs_clone_file_range,
 	.llseek = generic_file_llseek,
+	.fsync = cifs_dir_fsync,
 };
 
 static void

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <[email protected]>

commit 354d7793070611b4df5a79fbb0f12752d0ed0cc5 upstream.

Userspace controls @nice, sanitize the array index.

---
 kernel/sched/autogroup.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

@@ -7,6 +7,7 @@
 #include <linux/utsname.h>
 #include <linux/security.h>
 #include <linux/export.h>
+#include <linux/nospec.h>
 
 unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
 static struct autogroup autogroup_default;

@@ -213,7 +214,7 @@ int proc_sched_autogroup_set_nice(struct
 	static unsigned long next = INITIAL_JIFFIES;
 	struct autogroup *ag;
 	unsigned long shares;
-	int err;
+	int err, idx;
 
 	if (nice < MIN_NICE || nice > MAX_NICE)
 		return -EINVAL;

@@ -231,7 +232,9 @@ int proc_sched_autogroup_set_nice(struct
 
 	next = HZ / 10 + jiffies;
 	ag = autogroup_task_get(p);
-	shares = scale_load(sched_prio_to_weight[nice + 20]);
+
+	idx = array_index_nospec(nice + 20, 40);
+	shares = scale_load(sched_prio_to_weight[idx]);
 
 	down_write(&ag->lock);
 	err = sched_group_set_shares(ag->tg, shares);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Masami Hiramatsu <[email protected]>

commit 50268a3d266ecfdd6c5873d62b2758d9732fc598 upstream.

Fix string fetch function to terminate with NUL.
It is OK to drop the rest of string.

---
 kernel/trace/trace_uprobe.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -152,6 +152,8 @@ static void FETCH_FUNC_NAME(memory, stri
 		return;
 
 	ret = strncpy_from_user(dst, src, maxlen);
+	if (ret == maxlen)
+		dst[--ret] = '\0';
 
 	if (ret < 0) {	/* Failed to fetch string */
 		((u8 *)get_rloc_data(dest))[0] = '\0';

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <[email protected]>

commit ef9ee4ad38445a30909c48998624861716f2a994 upstream.

Userspace controls @config which contains 3 (byte) fields used for a 3 dimensional array deref.

---
 arch/x86/events/core.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

@@ -304,17 +304,20 @@ set_ext_hw_attr(struct hw_perf_event *hw
 
 	config = attr->config;
 
-	cache_type = (config >>  0) & 0xff;
+	cache_type = (config >> 0) & 0xff;
 	if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
 		return -EINVAL;
+	cache_type = array_index_nospec(cache_type, PERF_COUNT_HW_CACHE_MAX);
 
 	cache_op = (config >>  8) & 0xff;
 	if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
 		return -EINVAL;
+	cache_op = array_index_nospec(cache_op, PERF_COUNT_HW_CACHE_OP_MAX);
 
 	cache_result = (config >> 16) & 0xff;
 	if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
 		return -EINVAL;
+	cache_result = array_index_nospec(cache_result, PERF_COUNT_HW_CACHE_RESULT_MAX);
 
 	val = hw_cache_event_ids[cache_type][cache_op][cache_result];
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <[email protected]>

commit a5f81290ce475489fa2551c01a07470c1a4c932e upstream.

Userspace controls @attr, sanitize cfg (attr->config) before using it to index an array.

---
 arch/x86/events/intel/cstate.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -91,6 +91,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/perf_event.h>
+#include <linux/nospec.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
 #include "../perf_event.h"

@@ -301,6 +302,7 @@ static int cstate_pmu_event_init(struct
 	} else if (event->pmu == &cstate_pkg_pmu) {
 		if (cfg >= PERF_CSTATE_PKG_EVENT_MAX)
 			return -EINVAL;
+		cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_PKG_EVENT_MAX);
 		if (!pkg_msr[cfg].attr)
 			return -EINVAL;
 		event->hw.event_base = pkg_msr[cfg].msr;

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <[email protected]>

commit 06ce6e9b6d6c09d4129c6e24a1314a395d816c10 upstream.

Userspace controls @attr, sanitize cfg (attr->config) before using it to index an array.

---
 arch/x86/events/msr.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/perf_event.h>
+#include <linux/nospec.h>
 #include <asm/intel-family.h>
 
 enum perf_msr_id {

@@ -145,9 +146,6 @@ static int msr_event_init(struct perf_ev
 	if (event->attr.type != event->pmu->type)
 		return -ENOENT;
 
-	if (cfg >= PERF_MSR_EVENT_MAX)
-		return -EINVAL;
-
 	/* unsupported modes and filters */
 	if (event->attr.exclude_user   ||
 	    event->attr.exclude_kernel ||

@@ -158,6 +156,11 @@ static int msr_event_init(struct perf_ev
 	    event->attr.sample_period) /* no sampling */
 		return -EINVAL;
 
+	if (cfg >= PERF_MSR_EVENT_MAX)
+		return -EINVAL;
+
+	cfg = array_index_nospec((unsigned long)cfg, PERF_MSR_EVENT_MAX);
+
 	if (!msr[cfg].attr)
 		return -EINVAL;
 

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <[email protected]>

commit 4411ec1d1993e8dbff2898390e3fed280d88e446 upstream.

Userspace controls @pgoff through the fault address. Sanitize the array index before doing the array dereference.

---
 kernel/events/ring_buffer.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/circ_buf.h>
 #include <linux/poll.h>
+#include <linux/nospec.h>
 
 #include "internal.h"
 

@@ -863,8 +864,10 @@ perf_mmap_to_page(struct ring_buffer *rb
 			return NULL;
 
 		/* AUX space */
-		if (pgoff >= rb->aux_pgoff)
-			return virt_to_page(rb->aux_pages[pgoff - rb->aux_pgoff]);
+		if (pgoff >= rb->aux_pgoff) {
+			int aux_pgoff = array_index_nospec(pgoff - rb->aux_pgoff, rb->aux_nr_pages);
+			return virt_to_page(rb->aux_pages[aux_pgoff]);
+		}
 	}
 
 	return __perf_mmap_to_page(rb, pgoff);

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Zijlstra <[email protected]>

commit 46b1b577229a091b137831becaa0fae8690ee15a upstream.

Userspace controls @attr, sanitize @attr->config before passing it on to x86_pmu::event_map().

---
 arch/x86/events/core.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -27,6 +27,7 @@
 #include <linux/cpu.h>
 #include <linux/bitops.h>
 #include <linux/device.h>
+#include <linux/nospec.h>
 
 #include <asm/apic.h>
 #include <asm/stacktrace.h>

@@ -424,6 +425,8 @@ int x86_setup_perfctr(struct perf_event
 	if (attr->config >= x86_pmu.max_events)
 		return -EINVAL;
 
+	attr->config = array_index_nospec((unsigned long)attr->config, x86_pmu.max_events);
+
 	/*
 	 * The generic map:
 	 */

4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Paul Mackerras <[email protected]>

commit c3856aeb29402e94ad9b3879030165cc6a4fdc56 upstream.

This fixes several bugs in the radix page fault handler relating to the way large pages in the memory backing the guest were handled. First, the check for large pages only checked for explicit huge pages and missed transparent huge pages. Then the check that the addresses (host virtual vs. guest physical) had appropriate alignment was wrong, meaning that the code never put a large page in the partition scoped radix tree; it was always demoted to a small page.

Fixing this exposed bugs in kvmppc_create_pte(). We were never invalidating a 2MB PTE, which meant that if a page was initially faulted in without write permission and the guest then attempted to store to it, we would never update the PTE to have write permission. If we find a valid 2MB PTE in the PMD, we need to clear it and do a TLB invalidation before installing either the new 2MB PTE or a pointer to a page table page.

This also corrects an assumption that get_user_pages_fast would set the _PAGE_DIRTY bit if we are writing, which is not true. Instead we mark the page dirty explicitly with set_page_dirty_lock(). This also means we don't need the dirty bit set on the host PTE when providing write access on a read fault.

[[email protected] - use mark_pages_dirty instead of
kvmppc_update_dirty_map]