diff -pur tcpdump-3.9.1/print-ascii.c tcpdump-3.9.1-fixed/print-ascii.c
--- tcpdump-3.9.1/print-ascii.c	2004-07-22 00:00:10.000000000 +0200
+++ tcpdump-3.9.1-fixed/print-ascii.c	2005-07-06 15:28:22.000000000 +0200
@@ -142,6 +142,9 @@ hex_print_with_offset(register const cha
 	register int nshorts;
 
 	nshorts = (u_int) length / sizeof(u_short);
+	if(!nshorts)
+		return;
+
 	i = 0;
 	while (--nshorts >= 0) {
 		if ((i++ % 8) == 0) {
diff -pur tcpdump-3.9.1/print-ldp.c tcpdump-3.9.1-fixed/print-ldp.c
--- tcpdump-3.9.1/print-ldp.c	2005-06-16 03:10:35.000000000 +0200
+++ tcpdump-3.9.1-fixed/print-ldp.c	2005-07-06 15:21:24.000000000 +0200
@@ -559,7 +559,8 @@ ldp_msg_print(register const u_char *ppt
             return 0;
 
         msg_tptr=tptr+sizeof(struct ldp_msg_header);
-        msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
+	/* Type & Length fields not included */
+	msg_tlen = (msg_len >= (sizeof(struct ldp_msg_header) + 4)) ? (msg_len - sizeof(struct ldp_msg_header) + 4) : 0;
 
         /* did we capture enough for fully decoding the message ? */
         if (!TTEST2(*tptr, msg_len))