From d031302e0ec6bfddb905f4827782f9e6e338cf9d Mon Sep 17 00:00:00 2001
From: "Ronald S. Bultje" <rsbultje@gmail.com>
Date: Fri, 17 Feb 2012 12:10:33 -0800
Subject: [PATCH] cook: prevent div-by-zero if channels is zero.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit 941fc1ea1ed7f7d99a8b9e2607b41f2f2820394a)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
---
 libavcodec/cook.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/cook.c b/libavcodec/cook.c
index a8fa01e5d2..429b4d0155 100644
--- a/libavcodec/cook.c
+++ b/libavcodec/cook.c
@@ -1066,6 +1066,10 @@ static av_cold int cook_decode_init(AVCodecContext *avctx)
     q->sample_rate = avctx->sample_rate;
     q->nb_channels = avctx->channels;
     q->bit_rate = avctx->bit_rate;
+    if (!q->nb_channels) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
+        return AVERROR_INVALIDDATA;
+    }
 
     /* Initialize RNG. */
     av_lfg_init(&q->random_state, 0);