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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>
This commit is contained in:
Michael Niedermayer 2019-12-08 20:18:07 +01:00
parent c56a52a82c
commit 32fb919836
1 changed files with 6 additions and 1 deletions
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7
libavcodec/vc1dec.c
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@ -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;