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tcp: force a dst refcount when prequeue packet

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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>
This commit is contained in:
Eric Dumazet 2013-04-24 18:34:55 -07:00 • committed by David S. Miller
commit 093162553c
1 changed files with 1 additions and 0 deletions
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include/net/tcp.h
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@ -1049,6 +1049,7 @@ static inline bool tcp_prequeue(struct sock *sk, struct sk_buff *skb)
skb_queue_len(&tp->ucopy.prequeue) == 0) skb_queue_len(&tp->ucopy.prequeue) == 0)
return false; return false;
skb_dst_force(skb);
__skb_queue_tail(&tp->ucopy.prequeue, skb); __skb_queue_tail(&tp->ucopy.prequeue, skb);
tp->ucopy.memory += skb->truesize; tp->ucopy.memory += skb->truesize;
if (tp->ucopy.memory > sk->sk_rcvbuf) { if (tp->ucopy.memory > sk->sk_rcvbuf) {