diff --git a/epan/dissectors/packet-dcm.c b/epan/dissectors/packet-dcm.c

index 1dd8959..bcf613b 100644

--- a/epan/dissectors/packet-dcm.c

+++ b/epan/dissectors/packet-dcm.c

@@ -5697,6 +5697,10 @@ dissect_dcm_tag_value(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, dcm_s

     if (pdv->syntax == DCM_EBE)	is_little_endian = FALSE;

     else			is_little_endian = TRUE;

+    /* Make sure we have all the bytes of the item; this should throw

+       and exception if vl_max is so large that it causes the offset

+       to overflow. */

+    tvb_ensure_bytes_exist(tvb, offset, vl_max);

     /* ---------------------------------------------------------------------------

        Potentially long types. Obey vl_max