Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 10233] New: Wireshark crashes if Lua heuristic dissector returns true

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Bug ID	10233
Summary	Wireshark crashes if Lua heuristic dissector returns true
Classification	Unclassified
Product	Wireshark
Version	Git
Hardware	x86-64
OS	Windows 7
Status	UNCONFIRMED
Severity	Major
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	christopher.maynard@gtech.com

Build Information:
Compiled (64-bit) with GTK+ 2.24.23, with Cairo 1.10.2, with Pango 1.34.0, with
GLib 2.38.0, with WinPcap (4_1_3), with libz 1.2.5, with SMI 0.4.8, with c-ares
1.9.1, with Lua 5.2, with GnuTLS 3.1.22, with Gcrypt 1.6.0, without Kerberos,
with GeoIP, with PortAudio V19-devel (built Jun 23 2014), with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 3.1.22, Gcrypt 1.6.0, without AirPcap.
       Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz (with SSE4.2), with 8072MB of
physical memory.


Built using Microsoft Visual C++ 10.0 build 30319

--
As the title says, Wireshark crashes if a Lua heuristic dissector returns true.

Easy steps to reproduce (assuming your version of Wireshark already has Lua
support):

1) Visit http://wiki.wireshark.org/Lua/Examples and download the sample
dissector.lua and dns_port.pcap files.

2) Edit dissector.lua, changing the default settings as follows so that
heuristics are enabled and heur_dissect_dns() is guaranteed to be called:

    SETTING         OLD       NEW
    port            65333     64333
    heur_enabled    FALSE*    true

    *presumably this should have been false?

3) Copy dissector.lua into <personal configuration>\plugins\ folder.
4) Start Wireshark.
5) Load the dns_port.pcap file into Wireshark.  ==> Crash!

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