diff -up bind-9.5.0-P1/lib/dns/iptable.c.rh457175 bind-9.5.0-P1/lib/dns/iptable.c
--- bind-9.5.0-P1/lib/dns/iptable.c.rh457175	2008-01-21 22:02:24.000000000 +0100
+++ bind-9.5.0-P1/lib/dns/iptable.c	2008-07-31 16:10:46.000000000 +0200
@@ -117,16 +117,17 @@ dns_iptable_merge(dns_iptable_t *tab, dn
 			if (node->data[0] &&
 			    *(isc_boolean_t *) node->data[0] == ISC_TRUE)
 				new_node->data[0] = &dns_iptable_neg;
-			else
-				new_node->data[0] = node->data[0];
 
 			if (node->data[1] &&
 			    *(isc_boolean_t *) node->data[1] == ISC_TRUE)
 				new_node->data[1] = &dns_iptable_neg;
-			else
-				new_node->data[1] = node->data[0];
 		}
 
+		if (new_node->data[0] == NULL)
+			new_node->data[0] = node->data[0];
+		if (new_node->data[1] == NULL)
+			new_node->data[1] = node->data[1];
+
 		if (node->node_num[0] > max_node)
 			max_node = node->node_num[0];
 		if (node->node_num[1] > max_node)