--- /tmp/print-bootp.c	Mon Mar  1 18:49:40 2004
+++ print-bootp.c	Mon Mar  1 18:51:05 2004
@@ -556,6 +556,9 @@
 				break;
 
 			case TAG_CLIENT_FQDN:
+				/* option 81 should be at least 4 bytes long */
+				if (len < 4) 
+					break;
 				if (*bp++)
 					printf("[svrreg]");
 				if (*bp)