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avformat/iff: Check nb_channels == 0 in CHNL

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Fixes: division by 0
Fixes: 418396712/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-6104388018176000
Fixes: 418478219/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-4569544410857472

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5b1301004b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-06-21 02:01:22 +02:00
parent a1509a6c14
commit 093b349dd6
1 changed files with 1 additions and 1 deletions
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2
libavformat/iff.c
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@@ -280,7 +280,7 @@ static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
return AVERROR_INVALIDDATA;
st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
st->codecpar->ch_layout.nb_channels = avio_rb16(pb);
if (size < 2 + st->codecpar->ch_layout.nb_channels * 4)
if (size < 2 + st->codecpar->ch_layout.nb_channels * 4 || !st->codecpar->ch_layout.nb_channels)
return AVERROR_INVALIDDATA;
if (st->codecpar->ch_layout.nb_channels > FF_ARRAY_ELEMS(dsd_layout)) {
avpriv_request_sample(s, "channel layout");