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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-08 20:18:07 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-01-11 23:31:18 +0100 |
| commit | 32fb9198360402941e49aa878b9d33737b654f62 (patch) | |
| tree | 83f3c50c266c43318c264b23cd45bb904071f7ee | |
| parent | c56a52a82c0a4039e606e82b948a8abfe417f35f (diff) | |
| download | ffmpeg-32fb9198360402941e49aa878b9d33737b654f62.tar.gz | |
avcodec/vc1dec: Check field_mode for sprites
Fixes: Out of array read
Fixes: 19263/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5389219325542400
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1dec.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c index c81939c5a7..0a05989635 100644 --- a/libavcodec/vc1dec.c +++ b/libavcodec/vc1dec.c @@ -854,7 +854,12 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data, ret = AVERROR_INVALIDDATA; goto err; } - + if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) + && v->field_mode) { + av_log(v->s.avctx, AV_LOG_ERROR, "Sprite decoder: expected Frames not Fields\n"); + ret = AVERROR_INVALIDDATA; + goto err; + } if ((s->mb_height >> v->field_mode) == 0) { av_log(v->s.avctx, AV_LOG_ERROR, "image too short\n"); ret = AVERROR_INVALIDDATA; |