Dissector bug: failed assertion saved_layers_len < 500 in Wireshark

asked 2019-10-06 16:02:59 +0000

tamnguyen_287 gravatar image

updated 2019-10-06 16:38:32 +0000

Can someone help me explain what this error means and how to fix it this error

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Screen shot of error with full text here:

Code from packet.c:

 733  * XXX packet_info.curr_layer_num is a guint8 and *_MAX_RECURSION_DEPTH is
 734  * 100 elsewhere in the code. We should arguably use the same value here,
 735  * but using that makes suite_wslua.case_wslua.test_wslua_dissector_fpm fail.
 736  */
 737 #define PINFO_LAYER_MAX_RECURSION_DEPTH 500

 758         saved_proto = pinfo->current_proto;
 759         saved_can_desegment = pinfo->can_desegment;
 760         saved_layers_len = wmem_list_count(pinfo->layers);
 761         DISSECTOR_ASSERT(saved_layers_len < PINFO_LAYER_MAX_RECURSION_DEPTH);

Is it possible to upload part of the capture that included the section that makes the error?

Chuckc gravatar imageChuckc ( 2019-10-06 17:25:21 +0000 )edit

yeah. this is file .pcap and these error packets are at no.18744 and 18934. https://drive.google.com/open?id=1w0S...

tamnguyen_287 gravatar imagetamnguyen_287 ( 2019-10-06 17:28:24 +0000 )edit

Related bug: 15197

Chuckc gravatar imageChuckc ( 2019-10-06 17:29:09 +0000 )edit

Thank for the capture. It crashes Wireshark 3.0.4 on load. Can see the warnings with tshark:

Z:\>tshark -r ./2k-flows-b.pcap > tshark.out

** (tshark.exe:5920): WARNING **: Dissector bug, protocol IPv4, in packet 18150: C:\buildbot\builders\wireshark-3.0-32\windows-2019-x86\build\epan\packet.c:761: failed assertion "saved_layers_len < 500"

** (tshark.exe:5920): WARNING **: Dissector bug, protocol IPv4, in packet 18150: C:\buildbot\builders\wireshark-3.0-32\windows-2019-x86\build\epan\packet.c:761: failed assertion "saved_layers_len < 500"

** (tshark.exe:5920): WARNING **: Dissector bug, protocol IPv4, in packet 18774: C:\buildbot\builders\wireshark-3.0-32\windows-2019-x86\build\epan\packet.c:761: failed assertion "saved_layers_len < 500"

** (tshark.exe:5920): WARNING **: Dissector bug, protocol IPv4, in packet 18774: C:\buildbot\builders\wireshark-3.0-32\windows-2019-x86\build\epan\packet.c:761: failed assertion "saved_layers_len < 500"

** (tshark.exe:5920): WARNING **: Dissector bug, protocol IPv4, in packet 18934: C:\buildbot\builders\wireshark-3.0-32 ...
(more)
Chuckc gravatar imageChuckc ( 2019-10-06 17:35:00 +0000 )edit

Help me ! I can't see C:\buildbot\builders\wireshark-3.0-32\windows-2019-x86\build\epan\packet.c. I search file packet.c and nothing to be here

tamnguyen_287 gravatar imagetamnguyen_287 ( 2019-10-06 17:46:38 +0000 )edit
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