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avcodec/mpeg4videodec: consider lowres in dest_pcm[]

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Fixes: out of array access
Fixes: 59999/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5767982157266944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit d48476183f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-07-23 19:01:37 +02:00
parent 54d87e4b28
commit 10dfb498ea
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1 changed files with 1 additions and 1 deletions
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libavcodec/mpeg4videodec.c
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@ -123,7 +123,7 @@ void ff_mpeg4_decode_studio(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb
int hsub = i ? s->chroma_x_shift : 0;
int lowres = s->avctx->lowres;
int step = 1 << lowres;
dest_pcm[i] += (linesize[i] / 2) * ((16 >> vsub) - 1);
dest_pcm[i] += (linesize[i] / 2) * ((16 >> vsub + lowres) - 1);
for (int h = (16 >> (vsub + lowres)) - 1; h >= 0; h--){
for (int w = (16 >> (hsub + lowres)) - 1, idx = 0; w >= 0; w--, idx += step)
dest_pcm[i][w] = src[idx];