passt: Close UNIX domain socket on failure before accepting new connections

The socket isn't necessarily closed, make sure we close it before
getting a new one from accept(), so that we don't mix it up with
protocol sockets numbering.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

passt.c

@@ -876,8 +876,10 @@ loop:
 			if (events[i].events	& EPOLLRDHUP	||
 			    events[i].events	& EPOLLHUP	||
 			    events[i].events	& EPOLLERR	||
-			    tap_handler(&c, &now))
+			    tap_handler(&c, &now)) {
+				close(c.fd_unix);
 				goto listen;
+			}
 		} else {
 			sock_handler(&c, events[i].data.fd, events[i].events,
 				     &now);