[FFmpeg-cvslog] avcodec/vc1dec: Disable error concealment for *IMAGE
Michael Niedermayer
git at videolan.org
Tue Aug 10 19:05:32 EEST 2021
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Jul 31 00:01:53 2021 +0200| [643b2d49bf52d5a3205ce3db732e0c4c396bd457] | committer: Michael Niedermayer
avcodec/vc1dec: Disable error concealment for *IMAGE
The existing error concealment makes no sense for the image formats, they
use transformed source images which is different from keyframe + MC+difference
for which the error concealment is designed.
Of course feel free to re-enable this if you have a case where it works and
improves vissual results
Fixes: Timeout
Fixes: 36234/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-6300306743885824
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=643b2d49bf52d5a3205ce3db732e0c4c396bd457
---
libavcodec/vc1dec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 6cd74a09f1..1fb1950ade 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -1121,7 +1121,9 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
ret = AVERROR_INVALIDDATA;
goto err;
}
- if (!v->field_mode)
+ if ( !v->field_mode
+ && avctx->codec_id != AV_CODEC_ID_WMV3IMAGE
+ && avctx->codec_id != AV_CODEC_ID_VC1IMAGE)
ff_er_frame_end(&s->er);
}
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