Re: [FFmpeg-devel] [PATCH 4/7] avformat/iff: Check nb_channels == 0 in MHDR

[Michael Niedermayer <michael@niedermayer.cc>]

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On Fri, May 09, 2025 at 07:07:19PM +1000, Peter Ross wrote:
> On Thu, May 08, 2025 at 11:57:35PM +0200, Michael Niedermayer wrote:
> > Fixes: division by 0
> > Fixes: 395163171/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-542604339373670
> > 
> > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavformat/iff.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/libavformat/iff.c b/libavformat/iff.c
> > index 7142a06e98f..9402be48c98 100644
> > --- a/libavformat/iff.c
> > +++ b/libavformat/iff.c
> > @@ -510,6 +510,8 @@ static int iff_read_header(AVFormatContext *s)
> >                  sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
> >              else if (sta->codecpar->ch_layout.nb_channels == 2)
> >                  sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
> > +            else if (sta->codecpar->ch_layout.nb_channels == 0)
> > +                return AVERROR_INVALIDDATA;
> >              break;
> >  
> >          case ID_ABIT:
> 
> please apply

will apply

thx

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I am the wisest man alive, for I know one thing, and that is that I know
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