[FFmpeg-cvslog] smacker: validate number of channels

[Justin Ruggles]

ffmpeg | branch: release/0.8 | Justin Ruggles <justin.ruggles at gmail.com> | Wed Sep 21 11:37:51 2011 -0400| [7f7b2e89e270801ea5918afa1432d3bb32f6ebc7] | committer: Michael Niedermayer

smacker: validate number of channels
(cherry picked from commit e190e453bd1e4d4b409ed3556b3a50d1087c15d7)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7f7b2e89e270801ea5918afa1432d3bb32f6ebc7
---

 libavcodec/smacker.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
index be4bc23..30dbaa7 100644
--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -560,6 +560,10 @@ 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;