--- tcpdump-3.4/print-ip.c.iphl	Fri Aug 20 17:37:59 1999
+++ tcpdump-3.4/print-ip.c	Fri Aug 20 17:39:05 1999
@@ -463,6 +463,10 @@
 			(void)printf("truncated-ip %d", length);
 		return;
 	}
+	if (ip->ip_hl < 5) {
+		(void)printf("ip_hl < 5 (%d)", ip->ip_hl);
+		return;
+	}
 	hlen = ip->ip_hl * 4;
 
 	len = ntohs(ip->ip_len);