wireshark assertion issue

["Rach, Darshan" <DarshanR () nds com>]

Hi,

I have written a plugin to parse a new protocol called DASH in wireshark.
For packets which are fragmented, I have the following piece of code:

/* Multiple packets in response - last_packet_flag field is the last packet flag */
if(((block_number == 0) && (last_packet_flag == 0)) ||(block_number > 0))
{
                pkt->fragmented = TRUE;

                frag_msg = fragment_add_seq_check(tvb, packet_field_offset, pkt,
                                                                                  msgid, /* ID for fragments belonging 
together */
                                                                                  msg_fragment_table, /* list of 
message fragments */
                                                                                  msg_reassembled_table, /* list of 
reassembled messages */
                                                                                  block_number, /* fragment sequence 
number */
                                                                                  tvb_length_remaining(tvb, 
packet_field_offset), /* fragment length - to the end */
                                                                                  last_packet_flag); /* More fragments? 
*/

                new_tvb = process_reassembled_data(tvb, packet_field_offset, pkt,
                                                                                   "Reassembled OQTP Message",
                                                                                   frag_msg,
                                                                                   &msg_frag_items,
                                                                                   NULL,
                                                                                   oqtp_tree);

                /* Reassembled */
                if (frag_msg)
                {
                                col_append_str(pkt->cinfo, COL_INFO,
                                                                                   "(Reassembled OQTP Response)");
                }
                else
                {
                                /* Not last packet of reassembled short message */
                                col_append_fstr(pkt->cinfo, COL_INFO,
                                                                                    "(OQTP fragment %u)", block_number);
                }

                if (new_tvb) /* take it all */
                {
                                next_tvb = new_tvb;
                }
                else
                {
                                /* make a new subset */
                                next_tvb = tvb_new_subset(tvb, packet_field_offset, -1, -1);
                }
}

Doing this way, I am getting a DISSECTOR BUG.

[cid:image001.jpg@01CA6C3B.7C206AD0]

Kindly help what might have gone wrong?

Regards,
Darshan


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