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tcp: fix syn cookied MPTCP request socket leak 

If a syn-cookies request socket don't pass MPTCP-level
validation done in syn_recv_sock(), we need to release
it immediately, or it will be leaked.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/89
Fixes: 9466a1cceb ("mptcp: enable JOIN requests even if cookies are in use")
Reported-and-tested-by: Geliang Tang <geliangtang@gmail.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-10-02 12:39:44 +02:00 committed by David S. Miller
parent e7d4005d48
commit 9d8c05ad56
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/syncookies.c
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@ -214,7 +214,7 @@ struct sock *tcp_get_cookie_sock(struct sock *sk, struct sk_buff *skb,
sock_rps_save_rxhash(child, skb);
if (rsk_drop_req(req)) {
refcount_set(&req->rsk_refcnt, 2);
reqsk_put(req);
return child;
}