From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763990Ab3EDBAY (ORCPT ); Fri, 3 May 2013 21:00:24 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:3701 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763804Ab3EDBAS (ORCPT ); Fri, 3 May 2013 21:00:18 -0400 X-Authority-Analysis: v=2.0 cv=DKcNElxb c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=Ciwy3NGCPMMA:10 a=Qa1nW_C3DJQA:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=bNx0k-PIzlQA:10 a=1XWaLZrsAAAA:8 a=VwQbUJbxAAAA:8 a=49v6Z1639WieMjv4iLAA:9 a=UTB_XpHje0EA:10 a=9J5VuaLb3qoA:10 a=Zh68SRI7RUMA:10 a=jeBq3FmKZ4MA:10 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-Id: <20130504010016.582623355@goodmis.org> User-Agent: quilt/0.60-1 Date: Fri, 03 May 2013 20:59:57 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, linux-rt-users Cc: Thomas Gleixner , Carsten Emde , Sebastian Andrzej Siewior , John Kacur , , Mike Galbraith , Eric Dumazet Subject: [PATCH RT 2/6] tcp: force a dst refcount when prequeue packet References: <20130504005955.061874443@goodmis.org> Content-Disposition: inline; filename=0002-tcp-force-a-dst-refcount-when-prequeue-packet.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 0768715..fe46019 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -931,6 +931,7 @@ 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