[FFmpeg-devel] [PATCH] avcodec/magicyuv: Check that there are enough lines for interlacing to be possible

[Paul B Mahol]

lgtm

On 2/22/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: out of array access
> Fixes:
> 20763/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MAGICYUV_fuzzer-5759562508664832
>
> 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/magicyuv.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/libavcodec/magicyuv.c b/libavcodec/magicyuv.c
> index 21a32785bc..aacd0d4d7d 100644
> --- a/libavcodec/magicyuv.c
> +++ b/libavcodec/magicyuv.c
> @@ -659,6 +659,17 @@ static int magy_decode_frame(AVCodecContext *avctx,
> void *data,
>          return AVERROR_INVALIDDATA;
>      }
>
> +    if (s->interlaced) {
> +        if ((s->slice_height >> s->vshift[1]) < 2) {
> +            av_log(avctx, AV_LOG_ERROR, "impossible slice height\n");
> +            return AVERROR_INVALIDDATA;
> +        }
> +        if ((avctx->coded_height % s->slice_height) &&
> ((avctx->coded_height % s->slice_height) >> s->vshift[1]) < 2) {
> +            av_log(avctx, AV_LOG_ERROR, "impossible height\n");
> +            return AVERROR_INVALIDDATA;
> +        }
> +    }
> +
>      for (i = 0; i < s->planes; i++) {
>          av_fast_malloc(&s->slices[i], &s->slices_size[i], s->nb_slices *
> sizeof(Slice));
>          if (!s->slices[i])
> --
> 2.17.1
>
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