On 10/25/2020 8:00 PM, Michael Niedermayer wrote:
> Fixes: NULL pointer dereference
> Fixes:
> 26550/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-5417762807349248
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
> libavcodec/av1dec.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
> index a0a279d65b..bb4295aa6f 100644
> --- a/libavcodec/av1dec.c
> +++ b/libavcodec/av1dec.c
> @@ -673,7 +673,12 @@ static int av1_decode_frame(AVCodecContext *avctx, void
> *frame,
> for (int i = 0; i < s->current_obu.nb_units; i++) {
> CodedBitstreamUnit *unit = &s->current_obu.units[i];
> AV1RawOBU *obu = unit->content;
> - const AV1RawOBUHeader *header = &obu->header;
> + const AV1RawOBUHeader *header;
> +
> + if (!obu)
This looks like a "regression" since ae7686a64f, where ENOSYS (an error
code that's not propagated to the caller) on unsupported OBU types is
now returned before cbs_av1 even gets a chance to allocate the unit's
content.
Should be ok.
> + continue;
> +
> + header = &obu->header;
> av_log(avctx, AV_LOG_DEBUG, "Obu idx:%d, obu type:%d.\n", i,
> unit->type);
>
> switch (unit->type) {
>
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