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ALSA: usb-audio: Avoid access before bLength check in build_audio_procunit()
authorTakashi Iwai <tiwai@suse.de>
Wed, 19 Dec 2018 11:36:27 +0000 (12:36 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 13 Jan 2019 09:07:12 +0000 (10:07 +0100)
commit172236e69b714879fe534b1fa2e8ffed2c221ebc
tree5cc421384cef73b3b1f09bf19404085e257b5828tree | snapshot
parentcfd3b3d7b2ca5d081e2616fe3c26b3ffd414f279commit | diff
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>
sound/usb/mixer.c diff | blob | history
Domain: System / Kernel; Licenses: GPL-2.0;