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tcp: reset sk_rx_dst in tcp_disconnect() 

commit d747a7a51b00984127a88113cdbbc26f91e9d815 upstream.

We have to reset the sk->sk_rx_dst when we disconnect a TCP
connection, because otherwise when we re-connect it this
dst reference is simply overridden in tcp_finish_connect().

This fixes a dst leak which leads to a loopback dev refcnt
leak. It is a long-standing bug, Kevin reported a very similar
(if not same) bug before. Thanks to Andrei for providing such
a reliable reproducer which greatly narrows down the problem.

Fixes: 41063e9dd1 ("ipv4: Early TCP socket demux.")
Reported-by: Andrei Vagin <avagin@gmail.com>
Reported-by: Kevin Xu <kaiwen.xu@hulu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[wt: adjusted context]

Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
WANG Cong 2017-06-24 23:50:30 -07:00 committed by syphyr
parent 505bfb3397
commit 283436c062
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/tcp.c
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@ -2343,6 +2343,8 @@ int tcp_disconnect(struct sock *sk, int flags)
tcp_init_send_head(sk);
memset(&tp->rx_opt, 0, sizeof(tp->rx_opt));
__sk_dst_reset(sk);
dst_release(sk->sk_rx_dst);
sk->sk_rx_dst = NULL;
WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);