[FFmpeg-devel] [PATCH 1/4] avformat/mxfdec: check channel number in mxf_get_d10_aes3_packet()

[Tomas Härdin]

sön 2021-09-05 klockan 21:24 +0200 skrev Michael Niedermayer:
> Fixes: Out of array access
> Fixes: 37030/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-
> 5387719147651072
> 
> 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/mxfdec.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
> index 55f2e5c767..ebe411b04d 100644
> --- a/libavformat/mxfdec.c
> +++ b/libavformat/mxfdec.c
> @@ -552,6 +552,10 @@ static int mxf_get_d10_aes3_packet(AVIOContext
> *pb, AVStream *st, AVPacket *pkt,
>      data_ptr = pkt->data;
>      end_ptr = pkt->data + length;
>      buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */
> +
> +    if (st->codecpar->channels > 8)
> +        return AVERROR_INVALIDDATA;

Looks fine. Double-checked S331m, AES is limited to 8 channels

/Tomas