From b8551f8ea71b7d6ae39de121213860262d911001 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Fri, 9 Nov 2012 20:47:54 +0100
Subject: [PATCH] pcmdec: check that channels is valid.

Prevents a division by 0

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/pcm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
index 85a5fe6ed4..47a55091b3 100644
--- a/libavcodec/pcm.c
+++ b/libavcodec/pcm.c
@@ -288,6 +288,11 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
         return AVERROR(EINVAL);
     }
 
+    if (avctx->channels == 0) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
+        return AVERROR(EINVAL);
+    }
+
     n = avctx->channels * sample_size;
 
     if (n && buf_size % n) {