[FFmpeg-devel] [PATCH 1/4] avcodec/vp9_superframe_split_bsf: Check in size

[Michael Niedermayer]

On Sun, Mar 13, 2022 at 04:03:42PM -0300, James Almer wrote:
> 
> 
> On 3/12/2022 8:52 PM, Michael Niedermayer wrote:
> > Fixes: Out of array read
> > Fixes: 45137/clusterfuzz-testcase-minimized-ffmpeg_BSF_VP9_SUPERFRAME_SPLIT_fuzzer-4984270639202304
> > 
> > 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/vp9_superframe_split_bsf.c | 5 +++++
> >   1 file changed, 5 insertions(+)
> > 
> > diff --git a/libavcodec/vp9_superframe_split_bsf.c b/libavcodec/vp9_superframe_split_bsf.c
> > index ed0444561a..6af555c078 100644
> > --- a/libavcodec/vp9_superframe_split_bsf.c
> > +++ b/libavcodec/vp9_superframe_split_bsf.c
> > @@ -51,6 +51,11 @@ static int vp9_superframe_split_filter(AVBSFContext *ctx, AVPacket *out)
> >               return ret;
> >           in = s->buffer_pkt;
> > +        if (in->size == 0) {
> 
> !in->size

I favor checking "== 0" when its about the value 0 and !X when its about
something being not set / not allocated.
but i can change it if you prefer

thx
[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The smallest minority on earth is the individual. Those who deny 
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