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avcodec/h263dec: Sanity check against minimal I/P frame size

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Fixes: Timeout
Fixes: 49718/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-4874987894341632

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 2022-08-15 00:02:37 +02:00
parent 3b51e19922
commit ca4ff9c21c
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1 changed files with 2 additions and 0 deletions
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libavcodec/h263dec.c
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@ -546,6 +546,8 @@ retry:
avctx->has_b_frames = !s->low_delay;
if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
if (s->pict_type != AV_PICTURE_TYPE_B && s->mb_num/2 > get_bits_left(&s->gb))
return AVERROR_INVALIDDATA;
if (ff_mpeg4_workaround_bugs(avctx) == 1)
goto retry;
if (s->studio_profile != (s->idsp.idct == NULL))