commit: 60c961a9e1ed879a4d151df6076bf1203f595f73
From: Nicolai Krakowiak <nicolai.krakow...@gmail.com>
Date: Thu, 4 Aug 2011 15:56:27 +0200
Subject: [PATCH] ALSA: snd-usb: avoid dividing by zero on invalid input
Signed-off-by: Nicolai Krakowiak <nicolai.krakow...@gmail.com>
Acked-by: Daniel Mack <zon...@gmail.com>
Acked-by: Clemens Ladisch <clem...@ladisch.de>
Cc: sta...@kernel.org
Signed-off-by: Takashi Iwai <ti...@suse.de>
---
sound/usb/mixer.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index c22fa76..ee9aa08 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1191,6 +1191,11 @@ static int parse_audio_feature_unit(struct mixer_build
*state, int unitid, void
if (state->mixer->protocol == UAC_VERSION_1) {
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;
bmaControls = hdr->bmaControls;
} else {
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