tcp: Try to catch MSG_PEEK bug
This patch tries to print out more information when we hit the MSG_PEEK bug in tcp_recvmsg. It's been around since at least 2005 and it's about time that we finally fix it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1442,7 +1442,9 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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goto found_ok_skb;
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if (tcp_hdr(skb)->fin)
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goto found_fin_ok;
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WARN_ON(!(flags & MSG_PEEK));
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if (WARN_ON(!(flags & MSG_PEEK)))
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printk(KERN_INFO "recvmsg bug 2: copied %X "
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"seq %X\n", *seq, TCP_SKB_CB(skb)->seq);
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}
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/* Well, if we have backlog, try to process it now yet. */
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