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

[Michael Niedermayer <michael@niedermayer.cc>]

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On Mon, Mar 14, 2022 at 11:07:38AM -0300, James Almer wrote:
> 
> 
> On 3/14/2022 11:04 AM, Michael Niedermayer wrote:
> > 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@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
> 
> I suggested it for the sake of consistence. Most AVPacket.size checks use !X
> to check for 0.

changed
thx

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No human being will ever know the Truth, for even if they happen to say it
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