[FFmpeg-devel] [PATCH] avcodec/ac3dec: Fix shift signedness in mask creation

[Michael Niedermayer]

On Fri, Sep 21, 2018 at 09:30:36PM +0200, Michael Niedermayer wrote:
> On Fri, Sep 21, 2018 at 10:41:18AM -0300, James Almer wrote:
> > On 9/21/2018 9:30 AM, Michael Niedermayer wrote:
> > > Fixes: 9924/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EAC3_fuzzer-5473421772193792
> > > Fixes: left shift of 1 by 63 places cannot be represented in type 'long long'
> > > 
> > > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > > Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> > > ---
> > >  libavcodec/ac3dec.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
> > > index eed8ce5b39..e4d293a2aa 100644
> > > --- a/libavcodec/ac3dec.c
> > > +++ b/libavcodec/ac3dec.c
> > > @@ -1708,7 +1708,7 @@ dependent_frame:
> > >                      int i;
> > >  
> > >                      for (i = 0; i < 64; i++) {
> > > -                        if ((1LL << i) & ff_eac3_custom_channel_map_locations[ch][1]) {
> > > +                        if ((1ULL << i) & ff_eac3_custom_channel_map_locations[ch][1]) {
> > >                              int index = av_get_channel_layout_channel_index(channel_layout,
> > >                                                                              1LL << i);
> > 
> > What about this one?
> 
> i think the code is never reached with i==63, but i agree the 2nd one should
> be changed too if one is changed, its cleaner and more consistent. i will do 
> that

will apply with this change

thx

[...]

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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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