This is a note to let you know that I've just added the patch titled
af_unix: take receive queue lock while appending new skb
to the 4.3-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:
af_unix-take-receive-queue-lock-while-appending-new-skb.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Fri Dec 11 11:38:06 EST 2015
From: Hannes Frederic Sowa <[email protected]>
Date: Tue, 17 Nov 2015 15:10:59 +0100
Subject: af_unix: take receive queue lock while appending new skb
From: Hannes Frederic Sowa <[email protected]>
[ Upstream commit a3a116e04cc6a94d595ead4e956ab1bc1d2f4746 ]
While possibly in future we don't necessarily need to use
sk_buff_head.lock this is a rather larger change, as it affects the
af_unix fd garbage collector, diag and socket cleanups. This is too much
for a stable patch.
For the time being grab sk_buff_head.lock without disabling bh and irqs,
so don't use locked skb_queue_tail.
Fixes: 869e7c62486e ("net: af_unix: implement stream sendpage support")
Cc: Eric Dumazet <[email protected]>
Signed-off-by: Hannes Frederic Sowa <[email protected]>
Reported-by: Eric Dumazet <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/unix/af_unix.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1812,8 +1812,11 @@ alloc_skb:
skb->truesize += size;
atomic_add(size, &sk->sk_wmem_alloc);
- if (newskb)
+ if (newskb) {
+ spin_lock(&other->sk_receive_queue.lock);
__skb_queue_tail(&other->sk_receive_queue, newskb);
+ spin_unlock(&other->sk_receive_queue.lock);
+ }
unix_state_unlock(other);
mutex_unlock(&unix_sk(other)->readlock);
Patches currently in stable-queue which might be from
[email protected] are
queue-4.3/ipv6-add-complete-rcu-protection-around-np-opt.patch
queue-4.3/ipv6-check-rt-dst.from-for-the-dst_nocache-route.patch
queue-4.3/af-unix-passcred-support-for-sendpage.patch
queue-4.3/af_unix-don-t-append-consumed-skbs-to-sk_receive_queue.patch
queue-4.3/ipv6-avoid-creating-rtf_cache-from-a-rt-that-is-not-managed-by-fib6-tree.patch
queue-4.3/net-scm-fix-pax-detected-msg_controllen-overflow-in-scm_detach_fds.patch
queue-4.3/ipv6-check-expire-on-dst_nocache-route.patch
queue-4.3/af-unix-fix-use-after-free-with-concurrent-readers-while-splicing.patch
queue-4.3/ip_tunnel-disable-preemption-when-updating-per-cpu-tstats.patch
queue-4.3/af_unix-take-receive-queue-lock-while-appending-new-skb.patch
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