ALSA: usb-audio: Fix potential out-of-bound access at parsing SU

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commit f658f17b5e upstream.

The usb-audio driver may trigger an out-of-bound access at parsing a
malformed selector unit, as it checks the header length only after
evaluating bNrInPins field, which can be already above the given
length.  Fix it by adding the length check beforehand.

Fixes: 99fc86450c ("ALSA: usb-mixer: parse descriptors with structs")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Takashi Iwai 2017-11-21 17:00:32 +01:00 • committed by Greg Kroah-Hartman

parent 7a0e3e553e

commit 5f7873c994

1 changed files with 2 additions and 1 deletions

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sound/usb/mixer.c

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