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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 09:03:52 +0000 (10:03 +0100)
commitbeab6f305f4f271caa500170d7fed1d2bda6ea88
treef0056fccd4545654e578ab2378dfbe048df3a039tree | snapshot (tar.gz zip)
parent4cdad05eb6f773be68ae6b2686f933033b80f5a4commit | 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 | blame | history