[FFmpeg-devel] [PATCH 1/7] avcodec/vc1: Check for excessive resolution

[Paul B Mahol]

NAK

On Thu, Aug 15, 2019 at 11:51 PM Michael Niedermayer <michael at niedermayer.cc>
wrote:

> Fixes: overflow in aspect ratio calculation
> Fixes: signed integer overflow: 393215 * 14594 cannot be represented in
> type 'int'
> Fixes:
> 15728/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5661588893204480
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by
> <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
> Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/vc1dec.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index 9519864c55..2636ea701f 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -426,6 +426,11 @@ static av_cold int vc1_decode_init(AVCodecContext
> *avctx)
>      GetBitContext gb;
>      int ret;
>
> +    if (avctx->width > 1 << 14 || avctx->height > 1 << 14) {
> +        avpriv_request_sample(avctx, "Huge resolution");
> +        return AVERROR_PATCHWELCOME;
> +    }
> +
>      /* save the container output size for WMImage */
>      v->output_width  = avctx->width;
>      v->output_height = avctx->height;
> --
> 2.22.1
>
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