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tcp: initialize tp->copied_seq in case of cross SYN connection
Dmitry provided a syzkaller (http://github.com/google/syzkaller) generated program that triggers the WARNING at net/ipv4/tcp.c:1729 in tcp_recvmsg() : WARN_ON(tp->copied_seq != tp->rcv_nxt && !(flags & (MSG_PEEK | MSG_TRUNC))); His program is specifically attempting a Cross SYN TCP exchange, that we support (for the pleasure of hackers ?), but it looks we lack proper tcp->copied_seq initialization. Thanks again Dmitry for your report and testings. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -5683,6 +5683,7 @@ discard:
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tp->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;
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tp->copied_seq = tp->rcv_nxt;
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tp->rcv_wup = TCP_SKB_CB(skb)->seq + 1;
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/* RFC1323: The window in SYN & SYN/ACK segments is
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