From e190e453bd1e4d4b409ed3556b3a50d1087c15d7 Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Wed, 21 Sep 2011 11:37:51 -0400
Subject: [PATCH] smacker: validate number of channels

---
 libavcodec/smacker.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
index 496bbb5624..f3dec7f675 100644
--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -559,6 +559,10 @@ static av_cold int decode_end(AVCodecContext *avctx)
 
 static av_cold int smka_decode_init(AVCodecContext *avctx)
 {
+    if (avctx->channels < 1 || avctx->channels > 2) {
+        av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
+        return AVERROR(EINVAL);
+    }
     avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
     avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
     return 0;