tcp: md5: release request socket instead of listener

[ Upstream commit 729235554d805c63e5e274fcc6a98e71015dd847 ]

If tcp_v4_inbound_md5_hash() returns an error, we must release
the refcount on the request socket, not on the listener.

The bug was added for IPv4 only.

Fixes: 079096f103fac ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f66696c..bfcddee 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1597,8 +1597,10 @@ process:
                struct sock *nsk = NULL;
 
                sk = req->rsk_listener;
-               if (tcp_v4_inbound_md5_hash(sk, skb))
-                       goto discard_and_relse;
+               if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) {
+                       reqsk_put(req);
+                       goto discard_it;
+               }
                if (likely(sk->sk_state == TCP_LISTEN)) {
                        nsk = tcp_check_req(sk, skb, req, false);
                } else {