Index: src/racoon/isakmp.c
===================================================================
RCS file: /cvsroot/ipsec-tools/ipsec-tools/src/racoon/isakmp.c,v
--- src/racoon/isakmp.c	7 Mar 2005 00:30:37 -0000	1.36
+++ src/racoon/isakmp.c	7 Mar 2005 16:31:24 -0000
@@ -1352,7 +1352,7 @@ 
 
 		p->type = np;
 		p->len = ntohs(gen->len);
-		if (p->len == 0 || p->len > tlen) {
+		if (p->len < sizeof(struct isakmp_gen) || p->len > tlen) {
 			plog(LLV_DEBUG, LOCATION, NULL,
 				"invalid length of payload\n");
 			vfree(result);