[FFmpeg-cvslog] vc1dec: odd sized sprites are unsupported

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Wed Mar  6 00:03:58 2013 +0100| [058e1f8dd71b30e3181a36cc66c5a278ebf835ba] | committer: Michael Niedermayer

vc1dec: odd sized sprites are unsupported

It should be easy to add support but without a sample we would
not know if they work.

Fixes out of array reads

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=058e1f8dd71b30e3181a36cc66c5a278ebf835ba
---

 libavcodec/vc1dec.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 585918c..ff04508 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5292,6 +5292,11 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
             v->sprite_height > 1 << 14 ||
             v->output_width  > 1 << 14 ||
             v->output_height > 1 << 14) return -1;
+
+        if ((v->sprite_width&1) || (v->sprite_height&1)) {
+            av_log(avctx, AV_LOG_ERROR, "odd sprite\n");
+            return AVERROR_PATCHWELCOME;
+        }
     }
     return 0;
 }