[FFmpeg-devel] [PATCH] avcodec/tiff: Check stride for dng

[lance.lmwang at gmail.com]

On Mon, Jun 15, 2020 at 12:10:14AM +0200, Michael Niedermayer wrote:
> Fixes: assertion failure
> Fixes: 23422/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5746026064642048
> 
> 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/tiff.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
> index 010943c38c..26a936074f 100644
> --- a/libavcodec/tiff.c
> +++ b/libavcodec/tiff.c
> @@ -679,6 +679,10 @@ static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int strid
>          return 0;
>      }
>  
> +    if (is_dng && stride == 0)
> +        return AVERROR_INVALIDDATA;
> +
> +

why add two blank line here?

>      for (line = 0; line < lines; line++) {
>          if (src - ssrc > size) {
>              av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
> -- 
> 2.17.1
> 
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-- 
Thanks,
Limin Wang