--- cvs/iptables/iptables.c	2004-02-21 11:20:34.000000000 +0200
+++ cvs/iptables_dev/iptables.c	2004-04-05 16:29:33.256624816 +0300
@@ -780,7 +780,7 @@ parse_interface(const char *arg, char *v
 			   " (%i)", arg, IFNAMSIZ-1);
 
 	strcpy(vianame, arg);
-	if (vialen == 0)
+	if ( (vialen == 0) || (vialen == 1 && vianame[0] == '+') )
 		memset(mask, 0, IFNAMSIZ);
 	else if (vianame[vialen - 1] == '+') {
 		memset(mask, 0xFF, vialen - 1);