[FFmpeg-devel] [PATCH 6/6] avformat/mvi: Check audio_data_size to be non negative
James Almer
jamrial at gmail.com
Sun Apr 11 01:38:36 EEST 2021
On 4/10/2021 7:24 PM, Michael Niedermayer wrote:
> Fixes: left shift of negative value -224
> Fixes: 32144/clusterfuzz-testcase-minimized-ffmpeg_dem_MVI_fuzzer-4971479323246592
>
> 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/mvi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavformat/mvi.c b/libavformat/mvi.c
> index cfdbe5d273..10bf24408f 100644
> --- a/libavformat/mvi.c
> +++ b/libavformat/mvi.c
> @@ -73,7 +73,7 @@ static int read_header(AVFormatContext *s)
> avio_rl16(pb);
> avio_r8(pb);
>
> - if (frames_count == 0 || mvi->audio_data_size == 0)
> + if (frames_count == 0 || (int)mvi->audio_data_size <= 0)
Make audio_data_size an int in MviDemuxContext instead of casting it
here. Also, you could remove it from the context altogether, since it's
only used in read_header().
> return AVERROR_INVALIDDATA;
>
> if (version != 7 || player_version > 213) {
>
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