Patch "ipv6: do not set sk_destruct in IPV6_ADDRFORM sockopt" has been added to the 4.12-stable tree

This is a note to let you know that I've just added the patch titled

ipv6: do not set sk_destruct in IPV6_ADDRFORM sockopt

to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ipv6-do-not-set-sk_destruct-in-ipv6_addrform-sockopt.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Xin Long <[email protected]>
Date: Mon, 28 Aug 2017 10:45:01 +0800
Subject: ipv6: do not set sk_destruct in IPV6_ADDRFORM sockopt

From: Xin Long <[email protected]>

[ Upstream commit e8d411d2980723b8f8ba8e4dd78b694c5fd9ea3e ]

ChunYu found a kernel warn_on during syzkaller fuzzing:

[40226.038539] WARNING: CPU: 5 PID: 23720 at net/ipv4/af_inet.c:152 inet_sock_destruct+0x78d/0x9a0
[40226.144849] Call Trace:
[40226.147590]  <IRQ>
[40226.149859]  dump_stack+0xe2/0x186
[40226.176546]  __warn+0x1a4/0x1e0
[40226.180066]  warn_slowpath_null+0x31/0x40
[40226.184555]  inet_sock_destruct+0x78d/0x9a0
[40226.246355]  __sk_destruct+0xfa/0x8c0
[40226.290612]  rcu_process_callbacks+0xaa0/0x18a0
[40226.336816]  __do_softirq+0x241/0x75e
[40226.367758]  irq_exit+0x1f6/0x220
[40226.371458]  smp_apic_timer_interrupt+0x7b/0xa0
[40226.376507]  apic_timer_interrupt+0x93/0xa0

The warn_on happned when sk->sk_rmem_alloc wasn't 0 in inet_sock_destruct. As after commit f970bd9e3a06 ("udp: implement memory accounting helpers"), udp has changed to use udp_destruct_sock as sk_destruct where it would udp_rmem_release all rmem.

But IPV6_ADDRFORM sockopt sets sk_destruct with inet_sock_destruct after changing family to PF_INET. If rmem is not 0 at that time, and there is no place to release rmem before calling inet_sock_destruct, the warn_on will be triggered.

This patch is to fix it by not setting sk_destruct in IPV6_ADDRFORM sockopt any more. As IPV6_ADDRFORM sockopt only works for tcp and udp. TCP sock has already set it's sk_destruct with inet_sock_destruct and UDP has set with udp_destruct_sock since they're created.

---
 net/ipv6/ipv6_sockglue.c |    1 -
 1 file changed, 1 deletion(-)

@@ -242,7 +242,6 @@ static int do_ipv6_setsockopt(struct soc
 			pktopt = xchg(&np->pktoptions, NULL);
 			kfree_skb(pktopt);
 
-			sk->sk_destruct = inet_sock_destruct;
 			/*
 			 * ... and add it to the refcnt debug socks count
 			 * in the new family. -acme

Patches currently in stable-queue which might be from [email protected] are

queue-4.12/ip6_gre-update-mtu-properly-in-ip6gre_err.patch queue-4.12/ipv6-set-dst.obsolete-when-a-cached-route-has-expired.patch queue-4.12/ipv6-do-not-set-sk_destruct-in-ipv6_addrform-sockopt.patch queue-4.12/sctp-avoid-out-of-bounds-reads-from-address-storage.patch