Wireshark · Wireshark-dev: [Wireshark-dev] wireshark assertion issue

["Rach, Darshan" <DarshanR@xxxxxxx>]

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.

 

 

Kindly help what might have gone wrong?

 

Regards,

Darshan

 

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