Wireshark-bugs: [Wireshark-bugs] [Bug 6826] New: USB: unknown GET DESCRIPTOR response triggers a
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6826
Summary: USB: unknown GET DESCRIPTOR response triggers assert
failure
Product: Wireshark
Version: SVN
Platform: All
OS/Version: All
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: steve@xxxxxxxxxxxxxxx
Created attachment 7818
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=7818
Fix for the issue.
Build Information:
wireshark 1.7.1 (SVN Rev 40973 from /trunk)
Copyright 1998-2012 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+ 2.24.8, with Cairo 1.10.2, with Pango 1.29.4, with
GLib 2.30.2, with libpcap, with libz 1.2.5, with POSIX capabilities (Linux),
with SMI 0.4.8, with c-ares 1.7.4, with Lua 5.1, without Python, with GnuTLS
2.12.14, with Gcrypt 1.5.0, with MIT Kerberos, with GeoIP, with PortAudio
V19-devel (built May 5 2011 11:00:51), without AirPcap.
Running on Linux 3.2.2-1.fc16.x86_64, with locale en_US.UTF-8, with libpcap
version 1.1.1, with libz 1.2.5, GnuTLS 2.12.14, Gcrypt 1.5.0.
Built using gcc 4.6.2 20111027 (Red Hat 4.6.2-1).
--
The code that handles unknown GET DESCRIPTOR responses is incorrect.
It (A) assumes that the first 4 bytes of the response are a host-endian length,
and (2) tries to insert the unknown blob into the tree via a FT_BYTES item
passed to proto_tree_add_uint(). The latter causes an assert failure at
proto.c:2929.
To trigger the bug, comment out the USB_DT_RPIPE case in
packet-usb.c:dissect_usb_setup_get_descriptor_response() and attempt to dissect
a USB conversation involving a mouse.
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