From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , Hannes Frederic Sowa , "David S. Miller" Subject: [PATCH 4.3 05/71] af_unix: take receive queue lock while appending new skb Date: Sat, 12 Dec 2015 12:05:29 -0800 Message-Id: <20151212200537.028047310@linuxfoundation.org> In-Reply-To: <20151212200536.761001328@linuxfoundation.org> References: <20151212200536.761001328@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hannes Frederic Sowa [ 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 Signed-off-by: Hannes Frederic Sowa Reported-by: Eric Dumazet Acked-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- 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);