From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: [PATCH RT 1/4] tcp: force a dst refcount when prequeue packet Date: Fri, 03 May 2013 21:02:08 -0400 Message-ID: <20130504010229.679940374@goodmis.org> References: <20130504010207.365885836@goodmis.org> Cc: Thomas Gleixner , Carsten Emde , Sebastian Andrzej Siewior , John Kacur , , Mike Galbraith , Eric Dumazet To: linux-kernel@vger.kernel.org, linux-rt-users Return-path: Content-Disposition: inline; filename=0001-tcp-force-a-dst-refcount-when-prequeue-packet.patch Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org From: Eric Dumazet Before escaping RCU protected section and adding packet into prequeue, make sure the dst is refcounted. Cc: stable-rt@vger.kernel.org Reported-by: Mike Galbraith Signed-off-by: Eric Dumazet Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Steven Rostedt --- include/net/tcp.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/net/tcp.h b/include/net/tcp.h index b28a49f..4881cb6 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -902,6 +902,7 @@ static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb) if (sysctl_tcp_low_latency || !tp->ucopy.task) return 0; + skb_dst_force(skb); __skb_queue_tail(&tp->ucopy.prequeue, skb); tp->ucopy.memory += skb->truesize; if (tp->ucopy.memory > sk->sk_rcvbuf) { -- 1.7.10.4