From: Josh Boyer <jwboyer@fedoraproject.org>
Date: Mon, 14 Mar 2016 16:33:40 +0000 (-0700)
Subject: Input: powermate - fix oops with malicious USB descriptors
X-Git-Tag: v3.2.80~82
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=615fd7f1ce2ced5bd401aeac55cda44295c2ae58;p=pandora-kernel.git

Input: powermate - fix oops with malicious USB descriptors

commit 9c6ba456711687b794dcf285856fc14e2c76074f upstream.

The powermate driver expects at least one valid USB endpoint in its
probe function.  If given malicious descriptors that specify 0 for
the number of endpoints, it will crash.  Validate the number of
endpoints on the interface before using them.

The full report for this issue can be found here:
http://seclists.org/bugtraq/2016/Mar/85

Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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