Patch "udplite: call proper backlog handlers" has been added to the 4.8-stable tree

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

udplite: call proper backlog handlers

to the 4.8-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:
udplite-call-proper-backlog-handlers.patch
and it can be found in the queue-4.8 subdirectory.

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

From: Eric Dumazet <[email protected]>
Date: Tue, 22 Nov 2016 09:06:45 -0800
Subject: udplite: call proper backlog handlers

From: Eric Dumazet <[email protected]>

[ Upstream commit 30c7be26fd3587abcb69587f781098e3ca2d565b ]

In commits 93821778def10 ("udp: Fix rcv socket locking") and f7ad74fef3af ("net/ipv6/udp: UDP encapsulation: break backlog_rcv into __udpv6_queue_rcv_skb") UDP backlog handlers were renamed, but UDPlite was forgotten.

This leads to crashes if UDPlite header is pulled twice, which happens starting from commit e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")

Bug found by syzkaller team, thanks a lot guys !

Note that backlog use in UDP/UDPlite is scheduled to be removed starting from linux-4.10, so this patch is only needed up to linux-4.9

---
 net/ipv4/udp.c      |    2 +-
 net/ipv4/udp_impl.h |    2 +-
 net/ipv4/udplite.c  |    2 +-
 net/ipv6/udp.c      |    2 +-
 net/ipv6/udp_impl.h |    2 +-
 net/ipv6/udplite.c  |    2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

@@ -1451,7 +1451,7 @@ static void udp_v4_rehash(struct sock *s
 	udp_lib_rehash(sk, new_hash);
 }
 
-static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 {
 	int rc;
 

@@ -25,7 +25,7 @@ int udp_recvmsg(struct sock *sk, struct
 		int flags, int *addr_len);
 int udp_sendpage(struct sock *sk, struct page *page, int offset, size_t size,
 		 int flags);
-int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
+int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
 void udp_destroy_sock(struct sock *sk);
 
 #ifdef CONFIG_PROC_FS

@@ -50,7 +50,7 @@ struct proto 	udplite_prot = {
 	.sendmsg	   = udp_sendmsg,
 	.recvmsg	   = udp_recvmsg,
 	.sendpage	   = udp_sendpage,
-	.backlog_rcv	   = udp_queue_rcv_skb,
+	.backlog_rcv	   = __udp_queue_rcv_skb,
 	.hash		   = udp_lib_hash,
 	.unhash		   = udp_lib_unhash,
 	.get_port	   = udp_v4_get_port,

@@ -514,7 +514,7 @@ out:
 	return;
 }
 
-static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 {
 	int rc;
 

@@ -26,7 +26,7 @@ int compat_udpv6_getsockopt(struct sock
 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
 		  int flags, int *addr_len);
-int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
+int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
 void udpv6_destroy_sock(struct sock *sk);
 
 void udp_v6_clear_sk(struct sock *sk, int size);

@@ -45,7 +45,7 @@ struct proto udplitev6_prot = {
 	.getsockopt	   = udpv6_getsockopt,
 	.sendmsg	   = udpv6_sendmsg,
 	.recvmsg	   = udpv6_recvmsg,
-	.backlog_rcv	   = udpv6_queue_rcv_skb,
+	.backlog_rcv	   = __udpv6_queue_rcv_skb,
 	.hash		   = udp_lib_hash,
 	.unhash		   = udp_lib_unhash,
 	.get_port	   = udp_v6_get_port,

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

queue-4.8/ipv4-fix-memory-leak-in-exception-case-for-splitting-tries.patch queue-4.8/virtio-net-add-a-missing-synchronize_net.patch queue-4.8/gro_cells-mark-napi-struct-as-not-busy-poll-candidates.patch queue-4.8/udplite-call-proper-backlog-handlers.patch queue-4.8/ip6_offload-check-segs-for-null-in-ipv6_gso_segment.patch queue-4.8/ipv4-restore-fib_trie_flush_external-function-and-fix-call-ordering.patch queue-4.8/net-dccp-fix-use-after-free-in-dccp_invalid_packet.patch queue-4.8/net-avoid-signed-overflows-for-so_-snd-rcv-bufforce.patch queue-4.8/packet-fix-race-condition-in-packet_set_ring.patch