From 60c961a9e1ed879a4d151df6076bf1203f595f73 Mon Sep 17 00:00:00 2001
From: Nicolai Krakowiak <nicolai.krakowiak@gmail.com>
Date: Thu, 4 Aug 2011 15:56:27 +0200
Subject: ALSA: snd-usb: avoid dividing by zero on invalid input

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>
---
 sound/usb/mixer.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index c22fa76e363..ee9aa087d8b 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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