Revert "selinux: do not report error on connect(AF_UNSPEC)"

This reverts commit c7e0d6cc.

It was agreed a slightly different fix via the selinux tree.

v1 -> v2:
 - use the correct reverted commit hash
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

security/selinux/hooks.c

@@ -4649,7 +4649,7 @@ static int selinux_socket_connect_helper(struct socket *sock,
 		struct lsm_network_audit net = {0,};
 		struct sockaddr_in *addr4 = NULL;
 		struct sockaddr_in6 *addr6 = NULL;
-		unsigned short snum = 0;
+		unsigned short snum;
 		u32 sid, perm;
 
 		/* sctp_connectx(3) calls via selinux_sctp_bind_connect()
@@ -4674,12 +4674,12 @@ static int selinux_socket_connect_helper(struct socket *sock,
 			break;
 		default:
 			/* Note that SCTP services expect -EINVAL, whereas
-			 * others must handle this at the protocol level:
-			 * connect(AF_UNSPEC) on a connected socket is
-			 * a documented way disconnect the socket.
+			 * others expect -EAFNOSUPPORT.
 			 */
 			if (sksec->sclass == SECCLASS_SCTP_SOCKET)
 				return -EINVAL;
+			else
+				return -EAFNOSUPPORT;
 		}
 
 		err = sel_netport_sid(sk->sk_protocol, snum, &sid);