Wireshark-bugs: [Wireshark-bugs] [Bug 5575] New: Patch to fix memory leaks/errors in Lua plugin
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5575
Summary: Patch to fix memory leaks/errors in Lua plugin
Product: Wireshark
Version: SVN
Platform: All
OS/Version: All
Status: NEW
Severity: Major
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: bobby@xxxxxxxxxxxxxxx
Created an attachment (id=5717)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=5717)
Fix memory errors & Lua call-stack unwinding.
Build Information:
wireshark 1.5.0 (SVN Rev 35467 from /trunk)
Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (64-bit) with GTK+ 2.20.1, with GLib 2.24.1, with libpcap
1.0.1_pre20090708, with libz 1.2.3, with POSIX capabilities (Linux), without
libpcre, with SMI 0.4.8, with c-ares 1.6.0, with Lua 5.1, without Python, with
GnuTLS 2.8.1, with Gcrypt 1.4.4, with MIT Kerberos, with GeoIP, with PortAudio
V19-devel (built Jul 30 2009 21:58:27), with AirPcap.
Running on Linux 2.6.36-gentoo, with libpcap version 1.0.1_pre20090708, with
libz 1.2.3, GnuTLS 2.8.1, Gcrypt 1.4.4, without AirPcap.
Built using gcc 4.4.5.
--
I found & fixed a few memory access errors and leaks in the wslua plugin. Also
the Lua call-stack is not being unwound when a WireShark exception is thrown
during the executation of a Lua dissector.
The attached patch fixes these problems. To fix the unwinding of the Lua
call-stack when a WireShark exception is thrown, I added support for
pushing/poping "unwinders" functions (these are like the cleanup functions that
are called when an exception is thrown). The unwinder for Lua intercepts the
thrown exception and then calls lua_error() to make Lua clean-up it's
call-stack, the the WireShark exception is re-thrown.
I also added support for creating a Tvb object from a Lua string, this allows
Lua scripts to do more complex processing (i.e. decompression) of the packet
data without having to work on one byte at a time with get_index()/set_index()
functions.
--
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