Re: [FFmpeg-devel] [PATCH] lavc/vvc: Add check to num_multi_layer_olss

[James Almer <jamrial@gmail.com>]

On 1/30/2024 6:40 AM, post@frankplowman.com wrote:
> From: Frank Plowman <post@frankplowman.com>
> 
> Check that vps_each_layer_is_an_ols_flag, which indicates that "at
> least one OLS specified by the VPS contains more than one layer," is
> set if num_multi_layer_olss is non-zero.
> 
> Fixes: 65160/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_METADATA_fuzzer-4665241535119360
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Frank Plowman <post@frankplowman.com>
> ---
>   libavcodec/cbs_h266_syntax_template.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
> index 2f3478e5e1..37dc3acba0 100644
> --- a/libavcodec/cbs_h266_syntax_template.c
> +++ b/libavcodec/cbs_h266_syntax_template.c
> @@ -911,6 +911,8 @@ static int FUNC(vps) (CodedBitstreamContext *ctx, RWContext *rw,
>                   num_multi_layer_olss++;
>               }
>           }
> +        if (!current->vps_each_layer_is_an_ols_flag && num_multi_layer_olss == 0)
> +            return AVERROR_INVALIDDATA;
>       }
>   
>       for (i = 0; i <= current->vps_num_ptls_minus1; i++) {

Applied, thanks.
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