Re: [FFmpeg-devel] [PATCH 05/22] avformat/matroskadec: Use int64_t size

[Michael Niedermayer <michael@niedermayer.cc>]

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On Fri, Jul 12, 2024 at 10:42:38AM +0200, Andreas Rheinhardt wrote:
> Michael Niedermayer:
> > The length is 64bit that is passed into the functions.
> > Alternatively the values can be checked before cast
> > 
> > Fixes: CID1604572 Overflowed return value
> > 
> > Sponsored-by: Sovereign Tech Fund
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavformat/matroskadec.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
> > index aa28a37da4c..9914838698c 100644
> > --- a/libavformat/matroskadec.c
> > +++ b/libavformat/matroskadec.c
> > @@ -989,7 +989,7 @@ static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
> >   * Read the next element as an unsigned int.
> >   * Returns NEEDS_CHECKING unless size == 0.
> >   */
> > -static int ebml_read_uint(AVIOContext *pb, int size,
> > +static int ebml_read_uint(AVIOContext *pb, int64_t size,
> >                            uint64_t default_value, uint64_t *num)
> >  {
> >      int n = 0;
> > @@ -1010,7 +1010,7 @@ static int ebml_read_uint(AVIOContext *pb, int size,
> >   * Read the next element as a signed int.
> >   * Returns NEEDS_CHECKING unless size == 0.
> >   */
> > -static int ebml_read_sint(AVIOContext *pb, int size,
> > +static int ebml_read_sint(AVIOContext *pb, int64_t size,
> >                            int64_t default_value, int64_t *num)
> >  {
> >      int n = 1;
> > @@ -1033,7 +1033,7 @@ static int ebml_read_sint(AVIOContext *pb, int size,
> >   * Read the next element as a float.
> >   * Returns 0 if size == 0, NEEDS_CHECKING or < 0 on obvious failure.
> >   */
> > -static int ebml_read_float(AVIOContext *pb, int size,
> > +static int ebml_read_float(AVIOContext *pb, int64_t size,
> >                             double default_value, double *num)
> >  {
> >      if (size == 0) {
> 
> The values are already checked before that (via the max_lengths list).

Patch droped
teh issue is already marked as false positive as it was mixed with other false positive stuff

thx

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

In a rich man's house there is no place to spit but his face.
-- Diogenes of Sinope

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