Malformed NORM packets

When I do a capture using the NORM protocol I receive an error message saying that my CMD CC packets are malformed. I believe I’ve narrowed the problem down to the Congestion Control subtree. When it reaches the Congestion Control part, Wireshark creates hundreds of Congestion Control subtrees filled completely with zeroes, creating a bigger packet than Wireshark is expecting. Here is the section of the code that dissects NORM cmd(cc) packets:

static guint dissect_norm_cmd_cc(struct _norm *norm, proto_tree *tree,
 tvbuff_t *tvb, guint offset, packet_info *pinfo _U_)
{
  proto_tree_add_item(tree, hf.reserved, tvb, offset, 1, ENC_NA); offset ++;
  proto_tree_add_item(tree, hf.cc_sequence, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2;
proto_tree_add_item(tree, hf.cc_sts, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
proto_tree_add_item(tree, hf.cc_stus, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
if (offset < hdrlen2bytes(norm->hlen)) {
struct _fec_ptr f;
memset(&f, 0, sizeof f);
f.fec = &norm->fec;
f.hf = &hf.fec;
f.ett = &ett.fec;
f.prefs = &preferences.fec;
offset = dissect_norm_hdrext(norm, &f, tree, tvb, offset, pinfo);
}
while (tvb_reported_length_remaining(tvb, offset) > 0) {
proto_item *ti, *tif;
proto_tree *cc_tree, *flag_tree;
double grtt;
ti = proto_tree_add_text(tree, tvb, offset, 8, "Congestion Control");
cc_tree = proto_item_add_subtree(ti, ett.congestioncontrol);
proto_tree_add_item(cc_tree, hf.cc_node_id, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
tif = proto_tree_add_item(cc_tree, hf.cc_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
flag_tree = proto_item_add_subtree(tif, ett.flags);
proto_tree_add_item(flag_tree, hf.cc_flags_clr, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flag_tree, hf.cc_flags_plr, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flag_tree, hf.cc_flags_rtt, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flag_tree, hf.cc_flags_start, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flag_tree, hf.cc_flags_leave, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
grtt = UnquantizeRtt(tvb_get_guint8(tvb, offset));
proto_tree_add_double(cc_tree, hf.cc_rtt, tvb, offset, 1, grtt); offset += 1;
grtt = UnquantizeSendRate(tvb_get_ntohs(tvb, offset));
proto_tree_add_double(cc_tree, hf.cc_rate, tvb, offset, 2, grtt); offset += 2;
}
return offset;
}

The problem seems to be occurring in the “while” loop since Wireshark seems to recognize everything before that point. Sorry I cannot post a screenshot of the capture itself. I am using Wireshark-1.8.6 and the full code is located under /epan/dissectors/packet-rmt-norm.c.

I am fairly new to Wireshark so any advice on how to make Wireshark recognize this packet and fill it with useful information (activate the flags, register the node ID, etc.) would be much appreciated.