Add a check for a zero-length IE to "dissect_q2931_shift_ie()".

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@5337 f5534014-38df-0310-8fa8-9805f1628bb7

diff --git a/packet-q2931.c b/packet-q2931.c
index 042069fae3a3ff4863008d207938a5f2cb6f7b8c..19a868f737abc8e2b30715c204b17f3e857b9dc2 100644 (file)
--- a/packet-q2931.c
+++ b/packet-q2931.c
@@ -2,7 +2,7 @@
  * Routines for Q.2931 frame disassembly
  * Guy Harris <guy@alum.mit.edu>
  *
- * $Id: packet-q2931.c,v 1.23 2002/04/14 23:04:03 guy Exp $
+ * $Id: packet-q2931.c,v 1.24 2002/05/01 08:40:22 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@ethereal.com>
@@ -257,6 +257,8 @@ dissect_q2931_shift_ie(tvbuff_t *tvb, int offset, int len,
        gboolean non_locking_shift;
        guint8 codeset;
 
+       if (len == 0)
+               return;
        non_locking_shift = (info_element == Q2931_IE_BBAND_NLOCKING_SHIFT);
        codeset = tvb_get_guint8(tvb, offset) & 0x07;
        proto_tree_add_text(tree, tvb, offset, 1, "%s shift to codeset %u: %s",