[FFmpeg-devel] [PATCH 1/5] avcodec/midivid: Check vector index

[Paul B Mahol]

lgtm

On 2/9/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: out of array read
> Fixes:
> 20494/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVDV_fuzzer-5681452423577600
>
> 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/midivid.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/libavcodec/midivid.c b/libavcodec/midivid.c
> index bb5105bd57..8d4c3b369e 100644
> --- a/libavcodec/midivid.c
> +++ b/libavcodec/midivid.c
> @@ -126,6 +126,8 @@ static int decode_mvdv(MidiVidContext *s, AVCodecContext
> *avctx, AVFrame *frame)
>                  idx9bits--;
>                  idx = bytestream2_get_byte(gb) | (((idx9val >> (7 -
> idx9bits)) & 1) << 8);
>              }
> +            if (idx >= nb_vectors)
> +                return AVERROR_INVALIDDATA;
>
>              dsty[x  +frame->linesize[0]] = vec[idx * 12 + 0];
>              dsty[x+1+frame->linesize[0]] = vec[idx * 12 + 3];
> --
> 2.17.1
>
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