[FFmpeg-devel] [PATCH 2/2] avformat/mvdec: Use 64 bit in timestamp computation

[Peter Ross]

On Wed, Dec 15, 2021 at 06:37:13PM +0100, Michael Niedermayer wrote:
> Fixes: division by zero
> Fixes: 42198/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5054366405492736.fuzz
> Fixes: 42222/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-4561249331970048
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavformat/mvdec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
> index 8b54a9ab045..5d184f20a49 100644
> --- a/libavformat/mvdec.c
> +++ b/libavformat/mvdec.c
> @@ -381,7 +381,7 @@ static int mv_read_header(AVFormatContext *avctx)
>              avio_skip(pb, 8);
>              av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
>              av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
> -            timestamp += asize / (ast->codecpar->channels * bytes_per_sample);
> +            timestamp += asize / (ast->codecpar->channels * (uint64_t)bytes_per_sample);
>          }
>      } else if (!version && avio_rb16(pb) == 3) {
>          avio_skip(pb, 4);
> -- 
> 2.17.1

please apply.

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 195 bytes
Desc: not available
URL: <https://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20211216/cadb6da5/attachment.sig>