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avformat/iff: Check nb_channels == 0 in MHDR

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Fixes: division by 0
Fixes: 395163171/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-542604339373670

Reviewed-by: Peter Ross <pross@xvid.org>
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ce1fd73d63)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-05-08 23:10:52 +02:00
parent 3288cac76e
commit 7e55d3fb8f
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libavformat/iff.c
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@ -495,6 +495,8 @@ static int iff_read_header(AVFormatContext *s)
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
else if (st->codecpar->ch_layout.nb_channels == 2)
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
else if (st->codecpar->ch_layout.nb_channels == 0)
return AVERROR_INVALIDDATA;
break;
case ID_ABIT: