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avcodec/cbs_apv_syntax_template: Check tile_data_size

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Fixes: heap-buffer-overflow
Fixes: 418421333/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APV_fuzzer-6592025183191040
Fixes: 418804929/clusterfuzz-testcase-minimized-ffmpeg_BSF_APV_METADATA_fuzzer-5773904646045696
Fixes: 420737045/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APV_fuzzer-5535272169439232

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
2025-06-21 23:15:21 +02:00
parent ebcdba4c6b
commit f09c834a7d
1 changed files with 2 additions and 0 deletions
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libavcodec/cbs_apv_syntax_template.c
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@ -236,6 +236,8 @@ static int FUNC(tile)(CodedBitstreamContext *ctx, RWContext *rw,
#ifdef READ #ifdef READ
int pos = get_bits_count(rw); int pos = get_bits_count(rw);
av_assert0(pos % 8 == 0); av_assert0(pos % 8 == 0);
if (get_bits_left(rw) < 8LL * comp_size)
return AVERROR_INVALIDDATA;
current->tile_data[c] = (uint8_t*)align_get_bits(rw); current->tile_data[c] = (uint8_t*)align_get_bits(rw);
skip_bits_long(rw, 8 * comp_size); skip_bits_long(rw, 8 * comp_size);
#else #else