diff options
| author | WANG Cong <xiyou.wangcong@gmail.com> | 2017-06-24 23:50:30 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-21 07:44:54 +0200 |
| commit | 32a44f1ba7edf3d58afb1fdce852f800f476b622 (patch) | |
| tree | f3ee100a387b03a251cca82b91743c5e647671d9 /net/ipv4 | |
| parent | ccff2f4afbc183a163b2feb83132ead13d9283ed (diff) | |
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: 41063e9dd119 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 4bd8678329d6..0870a86e9d96 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2263,6 +2263,8 @@ 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; tcp_saved_syn_free(tp); WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |