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: NEric Dumazet <edumazet@google.com> Reported-by: NDmitry Vyukov <dvyukov@google.com> Tested-by: NDmitry Vyukov <dvyukov@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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