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tcp: purge write queue upon RST
[ Upstream commita27fd7a8ed
] When the connection is reset, there is no point in keeping the packets on the write queue until the connection is closed. RFC 793 (page 70) and RFC 793-bis (page 64) both suggest purging the write queue upon RST: https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-07 Moreover, this is essential for a correct MSG_ZEROCOPY implementation, because userspace cannot call close(fd) before receiving zerocopy signals even when the connection is reset. Fixes:f214f915e7
("tcp: enable MSG_ZEROCOPY") Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -4011,6 +4011,7 @@ void tcp_reset(struct sock *sk)
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/* This barrier is coupled with smp_rmb() in tcp_poll() */
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smp_wmb();
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tcp_write_queue_purge(sk);
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tcp_done(sk);
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if (!sock_flag(sk, SOCK_DEAD))
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