If the trailer is less than 4 bytes it's not a Gigamon hdr.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@33287 f5534014-38df-0310-8fa8-9805f1628bb7

1 files changed, 5 insertions, 0 deletions

diff --git a/epan/dissectors/packet-gmhdr.c b/epan/dissectors/packet-gmhdr.c
index 04fa14ddc9..18417878f5 100644
--- a/epan/dissectors/packet-gmhdr.c
+++ b/epan/dissectors/packet-gmhdr.c
@@ -199,6 +199,11 @@ dissect_gmtrailer(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
   guint offset;
   guint16 cksum, comp_cksum;
   
+  offset  = tvb_reported_length(tvb);
+  if (offset<4){
+	  return 0;
+  }
+ 
   /* See if this packet has a Gigamon trailer, if yes, then decode it */ 
   if (tvb_get_ntohs(tvb, -4) != ETHERTYPE_GIGAMON) {
     return 0;