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ALSA: snd-usb: avoid dividing by zero on invalid input

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Signed-off-by: Nicolai Krakowiak <nicolai.krakowiak@gmail.com>
Acked-by: Daniel Mack <zonque@gmail.com>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Nicolai Krakowiak 2011-08-04 15:56:27 +02:00 committed by Takashi Iwai
parent 824818b148
commit 60c961a9e1
1 changed files with 5 additions and 0 deletions
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5
sound/usb/mixer.c
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@ -1191,6 +1191,11 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
if (state->mixer->protocol == UAC_VERSION_1) { if (state->mixer->protocol == UAC_VERSION_1) {
csize = hdr->bControlSize; csize = hdr->bControlSize;
if (!csize) {
snd_printdd(KERN_ERR "usbaudio: unit %u: "
"invalid bControlSize == 0\n", unitid);
return -EINVAL;
}
channels = (hdr->bLength - 7) / csize - 1; channels = (hdr->bLength - 7) / csize - 1;
bmaControls = hdr->bmaControls; bmaControls = hdr->bmaControls;
} else { } else {