[FFmpeg-devel] [PATCH 4/6] avcodec/evc_parse: Check log2_sub_gop_length

[James Almer]

On 6/18/2023 6:50 PM, Michael Niedermayer wrote:
> Fixes: 1.70141e+38 is outside the range of representable values of type 'int'
> Fixes: 59883/clusterfuzz-testcase-minimized-ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5557887217565696
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>   libavcodec/evc_parse.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c
> index 44be5c5291..822b236423 100644
> --- a/libavcodec/evc_parse.c
> +++ b/libavcodec/evc_parse.c
> @@ -277,6 +277,8 @@ EVCParserSPS *ff_evc_parse_sps(EVCParserContext *ctx, const uint8_t *bs, int bs_
>   
>       if (!sps->sps_pocs_flag || !sps->sps_rpl_flag) {
>           sps->log2_sub_gop_length = get_ue_golomb(&gb);
> +        if (sps->log2_sub_gop_length > 5U)
> +            return NULL;
>           if (sps->log2_sub_gop_length == 0)
>               sps->log2_ref_pic_gap_length = get_ue_golomb(&gb);
>       }

LGTM, but please let me apply it as part of my evc patchset to prevent 
conflicts.