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avcodec/vqcdec: Check width & 15

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Various parts of the code assume that width can be divided by various powers of 2
without rounding

Fixes: out of array access
Fixes: 53623/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VQC_fuzzer-6209269924233216

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-11-23 21:27:13 +01:00
parent 2401494e96
commit a9d15d43eb
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1 changed files with 3 additions and 0 deletions
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libavcodec/vqcdec.c
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@ -71,6 +71,9 @@ static av_cold int vqc_decode_init(AVCodecContext * avctx)
static AVOnce init_static_once = AV_ONCE_INIT;
VqcContext *s = avctx->priv_data;
if (avctx->width & 15)
return AVERROR_PATCHWELCOME;
s->vectors = av_malloc((avctx->width * avctx->height * 3) / 2);
if (!s->vectors)
return AVERROR(ENOMEM);