From: Guy Harris <guy@alum.mit.edu>
Date: Sun, 1 Mar 2015 19:00:21 +0000 (-0800)
Subject: Don't run past the snaplength when printing a packet with a too-short LI.
X-Git-Url: https://git.tcpdump.org/tcpdump/commitdiff_plain/1bafbdaf19c8eb6fdd792ce529bda4fabc6d0595

Don't run past the snaplength when printing a packet with a too-short LI.

Fixes GitHub issue #437.
---

diff --git a/print-isoclns.c b/print-isoclns.c
index 4f8a5bb7..15d7294b 100644
--- a/print-isoclns.c
+++ b/print-isoclns.c
@@ -1068,7 +1068,7 @@ esis_print(const u_int8_t *pptr, u_int length)
 
 	if (li < sizeof(struct esis_header_t) + 2) {
             printf(" length indicator < min PDU size %d:", li);
-            while (--length != 0)
+            while (pptr < snapend)
                 printf("%02X", *pptr++);
             return;
 	}