Re: [FFmpeg-devel] [PATCH 3/4] avcodec/cbs_h266_syntax_template: Check tile_y

[Nuo Mi <nuomi2021@gmail.com>]

On Thu, Mar 21, 2024 at 9:15 AM Michael Niedermayer <michael@niedermayer.cc>
wrote:

> Fixes: out of array access
> Fixes:
> 67021/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4883576579489792
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by
> <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
> Michael Niedermayer <michael@niedermayer.cc>
>

Pushed this one.
Thank you, Michael.

> ---
>  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 49fb12ba77..0aae9fdfd5 100644
> --- a/libavcodec/cbs_h266_syntax_template.c
> +++ b/libavcodec/cbs_h266_syntax_template.c
> @@ -2072,6 +2072,8 @@ static int FUNC(pps) (CodedBitstreamContext *ctx,
> RWContext *rw,
>
>                  tile_x = tile_idx % current->num_tile_columns;
>                  tile_y = tile_idx / current->num_tile_columns;
> +                if (tile_y >= current->num_tile_rows)
> +                    return AVERROR_INVALIDDATA;
>
>                  ctu_x = 0, ctu_y = 0;
>                  for (j = 0; j < tile_x; j++) {
> --
> 2.17.1
>
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