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

[Peter Ross]

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 at 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

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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