From: Xi Wang <xi.wang@gmail.com>
Date: Tue, 14 Feb 2012 10:18:48 +0000 (-0500)
Subject: ALSA: usb-audio: avoid integer overflow in create_fixed_stream_quirk()
X-Git-Tag: v3.2.47~70
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c8d23aefec3e8b6a8717a0ea469c332a03b1a8a;p=pandora-kernel.git

ALSA: usb-audio: avoid integer overflow in create_fixed_stream_quirk()

commit 8866f405efd4171f9d9c91901d2dd02f01bacb60 upstream.

A malicious USB device could feed in a large nr_rates value.  This would
cause the subsequent call to kmemdup() to allocate a smaller buffer than
expected, leading to out-of-bounds access.

This patch validates the nr_rates value and reuses the limit introduced
in commit 4fa0e81b ("ALSA: usb-audio: fix possible hang and overflow
in parse_uac2_sample_rate_range()").

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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