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avcodec/cbs_h266_syntax_template: Check num_output_layers_in_ols

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from the specification:
For each OLS, there shall be at least one layer that is an output layer. In other words, for any value of i in the range of 0
to TotalNumOlss − 1, inclusive, the value of NumOutputLayersInOls[ i ] shall be greater than or equal to 1

Fixes: index 257 out of bounds for type 'uint8_t [257]'
Fixes: 61160/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_METADATA_fuzzer-6709397181825024

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Nuo Mi 2023-09-19 23:25:55 +08:00 committed by Michael Niedermayer
parent 13d22dc454
commit 9ef20920ab
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libavcodec/cbs_h266_syntax_template.c
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@ -891,6 +891,8 @@ static int FUNC(vps) (CodedBitstreamContext *ctx, RWContext *rw,
}
}
}
if (!num_output_layers_in_ols[i])
return AVERROR_INVALIDDATA;
}
for (i = 1; i < total_num_olss; i++) {
int num_layers_in_ols = 0;