From: Hannes Frederic Sowa Date: Tue, 17 Nov 2015 14:10:59 +0000 (+0100) Subject: af_unix: take receive queue lock while appending new skb X-Git-Tag: v4.4-rc2~28^2~2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=a3a116e04cc6a94d595ead4e956ab1bc1d2f4746;p=linux-2.6-block.git af_unix: take receive queue lock while appending new skb 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 Signed-off-by: Hannes Frederic Sowa Reported-by: Eric Dumazet Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index a8352db5c5b5..955ec152cb71 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1813,8 +1813,11 @@ 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);