[FFmpeg-devel] [PATCH] avcodec/h263dec: Check input size before GEOV/GEOX special case handling

[Andreas Rheinhardt]

Michael Niedermayer:
> Fixes: Timeout
> Fixes: 44921/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-6546588791603200
> 
> 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/h263dec.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
> index e940b7f7c7..56a41f6d05 100644
> --- a/libavcodec/h263dec.c
> +++ b/libavcodec/h263dec.c
> @@ -702,6 +702,7 @@ frame_end:
>  
>      if (s->last_picture_ptr || s->low_delay) {
>          if (   pict->format == AV_PIX_FMT_YUV420P
> +            && buf_size*16LL > s->mb_num
>              && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
>              int x, y, p;
>              av_frame_make_writable(pict);

Does https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293358.html
not fix the timeout?

- Andreas