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

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


From: Eric Dumazet <[email protected]>

[ Upstream commit 093162553c33e9479283e107b4431378271c735d ]

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

Reported-by: Mike Galbraith <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 include/net/tcp.h |    1 +
 1 file changed, 1 insertion(+)

--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1049,6 +1049,7 @@ static inline bool tcp_prequeue(struct s
            skb_queue_len(&tp->ucopy.prequeue) == 0)
                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) {


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