Re: [FFmpeg-devel] [PATCH v2 2/2] avformat/mov: validate box size for stts

[Michael Niedermayer <michael@niedermayer.cc>]

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On Thu, Dec 23, 2021 at 12:54:58PM +0530, Gyan Doshi wrote:
> 
> 
> On 2021-12-23 03:04 am, Michael Niedermayer wrote:
> > On Wed, Dec 22, 2021 at 06:17:28PM +0530, Gyan Doshi wrote:
> > > ---
> > >   libavformat/mov.c | 6 ++++++
> > >   1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/libavformat/mov.c b/libavformat/mov.c
> > > index 7de95b7ab0..1e44c74944 100644
> > > --- a/libavformat/mov.c
> > > +++ b/libavformat/mov.c
> > > @@ -2969,6 +2969,12 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
> > >       avio_rb24(pb); /* flags */
> > >       entries = avio_rb32(pb);
> > > +    if (validate_box_size(c, atom, pb, avio_tell(pb)-8, 8+(int64_t)entries*8, 0)) {
> > > +        av_log(c->fc, AV_LOG_ERROR, "Invalid or incomplete %s box in stream %d\n",
> > > +               av_fourcc2str(atom.type), c->fc->nb_streams-1);
> > > +       return AVERROR_INVALIDDATA;
> > > +    }
> > > +
> > >       av_log(c->fc, AV_LOG_TRACE, "track[%u].stts.entries = %u\n",
> > >               c->fc->nb_streams-1, entries);
> > this breaks playback of
> > 
> > ./ffplay H263_NM_f.mp4
> 
> Sent revised set.
> 
> However, do we need to allow this?

yes
its a real world file its not crafted to be funky 

thx

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Observe your enemies, for they first find out your faults. -- Antisthenes

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