net: tipc: fix possible refcount leak in tipc_sk_create()

Free sk in case tipc_sk_insert() fails.
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/socket.c

@@ -502,6 +502,7 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
 	sock_init_data(sock, sk);
 	tipc_set_sk_state(sk, TIPC_OPEN);
 	if (tipc_sk_insert(tsk)) {
+		sk_free(sk);
 		pr_warn("Socket create failed; port number exhausted\n");
 		return -EINVAL;
 	}