[29/65] tcp: force a dst refcount when prequeue packet

Steven Rostedt
2013-06-03T22:18:07Z

[-- Attachment #1: 0029-tcp-force-a-dst-refcount-when-prequeue-packet.patch --]
[-- Type: text/plain, Size: 1031 bytes --]

3.6.11.5 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit 093162553c33e9479283e107b4431378271c735d ]

Before escaping RCU protected section and adding packet into
prequeue, make sure the dst is refcounted.

Reported-by: Mike Galbraith <bitbucket@online.de>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
include/net/tcp.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 1f000ff..9297897 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1015,6 +1015,7 @@ static inline bool tcp_prequeue(struct sock *sk, struct sk_buff *skb)
if (sysctl_tcp_low_latency || !tp->ucopy.task)
return false;

+ 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