On 3/23/2019 5:25 PM, Michael Niedermayer wrote:
> Fixes: NULL pointer dereference and out of array access
> Fixes:
> 13871/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5746167087890432
> Fixes:
> 13845/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5650370728034304
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
> libavcodec/hevcdec.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
> index 86adab0ae1..4d149f4d9f 100644
> --- a/libavcodec/hevcdec.c
> +++ b/libavcodec/hevcdec.c
> @@ -488,6 +488,9 @@ static int hls_slice_header(HEVCContext *s)
>
> // Coded parameters
> sh->first_slice_in_pic_flag = get_bits1(gb);
> + if (s->ref && sh->first_slice_in_pic_flag)
> + return 0; // This slice will be skiped later, do not corrupt state
I assume this is a regression after 70c8c8a818? If so, please also
backport this patch to branches 2.8 to 4.1.
> +
> if ((IS_IDR(s) || IS_BLA(s)) && sh->first_slice_in_pic_flag) {
> s->seq_decode = (s->seq_decode + 1) & 0xff;
> s->max_ra = INT_MAX;
>
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