tproxy: fixe a possible read from an invalid location in the socket match

TIME_WAIT sockets need to be handled specially, and the socket match
casted inet_timewait_sock instances to inet_sock, which are not
compatible.

Handle this special case by checking sk->sk_state.

Signed-off-by: Balazs Scheidler <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/netfilter/xt_socket.c

···
 	sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol,
 				   saddr, daddr, sport, dport, par->in, false);
 	if (sk != NULL) {
-		bool wildcard = (inet_sk(sk)->rcv_saddr == 0);
+		bool wildcard = (sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->rcv_saddr == 0);
 
 		nf_tproxy_put_sock(sk);
 		if (wildcard)