tree f0056fccd4545654e578ab2378dfbe048df3a039
parent 4cdad05eb6f773be68ae6b2686f933033b80f5a4
author Takashi Iwai <tiwai@suse.de> 1545219387 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1547370232 +0100

ALSA: usb-audio: Avoid access before bLength check in build_audio_procunit()

commit f4351a199cc120ff9d59e06d02e8657d08e6cc46 upstream.

The parser for the processing unit reads bNrInPins field before the
bLength sanity check, which may lead to an out-of-bound access when a
malformed descriptor is given.  Fix it by assignment after the bLength
check.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>