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

[Michael Niedermayer <michael@niedermayer.cc>]

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On Sun, Mar 13, 2022 at 04:52:25PM +0100, Marton Balint wrote:
> 
> 
> On Sun, 13 Mar 2022, Michael Niedermayer wrote:
> 
> > Signed-off-by: Michael Niedermayer <michael@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);
> 

> I suggest you hard fail if the read count is not the expected, do not
> silently ignore corrupt file.
> 
> Regards,
> Marton
> 
> > +        return   ret < 0 ? ret : AVERROR_INVALIDDATA;

Does it not hard fail here ?

thx

[...]
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