[FFmpeg-devel] [PATCH 3/4] avformat/mxfdec: Check for avio_read() failure in mxf_read_strong_ref_array()

[Michael Niedermayer]

On Mon, Mar 14, 2022 at 08:21:04PM +0100, Tomas Härdin wrote:
> sön 2022-03-13 klockan 00:52 +0100 skrev Michael Niedermayer:
> > Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> > ---
> >  libavformat/mxfdec.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
> > index d7cdd22c8a..828fc0f9f1 100644
> > --- a/libavformat/mxfdec.c
> > +++ b/libavformat/mxfdec.c
> > @@ -932,6 +932,7 @@ static int mxf_read_cryptographic_context(void
> > *arg, AVIOContext *pb, int tag, i
> >  
> >  static int mxf_read_strong_ref_array(AVIOContext *pb, UID **refs,
> > int *count)
> >  {
> > +    int64_t ret;
> >      unsigned c = avio_rb32(pb);
> >  
> >      //avio_read() used int
> > @@ -946,7 +947,12 @@ static int mxf_read_strong_ref_array(AVIOContext
> > *pb, UID **refs, int *count)
> >          return AVERROR(ENOMEM);
> >      }
> >      avio_skip(pb, 4); /* useless size of objects, always 16
> > according to specs */
> > -    avio_read(pb, (uint8_t *)*refs, *count * sizeof(UID));
> > +    ret = avio_read(pb, (uint8_t *)*refs, *count * sizeof(UID));
> > +    if (ret != *count * sizeof(UID)) {
> > +        *count = ret < 0 ? 0   : ret / sizeof(UID);
> > +        return   ret < 0 ? ret : AVERROR_INVALIDDATA;
> 
> Looks ok

i will apply once we agree on the previous patch as that is on top of it

thx

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

Asymptotically faster algorithms should always be preferred if you have
asymptotical amounts of data
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