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net/x25: Fix x25_neigh refcnt leak when x25 disconnect

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x25_connect() invokes x25_get_neigh(), which returns a reference of the
specified x25_neigh object to "x25->neighbour" with increased refcnt.

When x25 connect success and returns, the reference still be hold by
"x25->neighbour", so the refcount should be decreased in
x25_disconnect() to keep refcount balanced.

The reference counting issue happens in x25_disconnect(), which forgets
to decrease the refcnt increased by x25_get_neigh() in x25_connect(),
causing a refcnt leak.

Fix this issue by calling x25_neigh_put() before x25_disconnect()
returns.

Signed-off-by: Xiyu Yang <[email protected]>
Signed-off-by: Xin Tan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Xiyu Yang authored and David S. Miller committed 2020-04-27 11:20:30 -07:00
1 parent 095f5614bf
commit 4becb7ee5b
1 file changed
+4
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net/x25/x25_subr.c
+4
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@@ -357,6 +357,10 @@ void x25_disconnect(struct sock *sk, int reason, unsigned char cause,
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
}
read_lock_bh(&x25_list_lock);
x25_neigh_put(x25->neighbour);
x25->neighbour = NULL;
read_unlock_bh(&x25_list_lock);
}
/*