ALSA: usb-audio: Add sanity checks for endpoint accesses

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commit 447d6275f0 upstream.

Add some sanity check codes before actually accessing the endpoint via
get_endpoint() in order to avoid the invalid access through a
malformed USB descriptor.  Mostly just checking bNumEndpoints, but in
one place (snd_microii_spdif_default_get()), the validity of iface and
altsetting index is checked as well.

Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=971125
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: Moritz Muehlenhoff <jmm@inutil.org>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Takashi Iwai 2016-03-15 15:20:58 +01:00 • committed by Luis Henriques

parent b92dbabac3

commit 3b49b00d84

4 changed files with 11 additions and 0 deletions

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2

sound/usb/clock.c

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3

sound/usb/endpoint.c

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4

sound/usb/mixer_quirks.c

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2

sound/usb/pcm.c

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