* [FFmpeg-devel] [PR] avformat/iff: Error out with 0 channel loudspeaker configuration (PR #21671)
@ 2026-02-07 1:53 michaelni via ffmpeg-devel
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From: michaelni via ffmpeg-devel @ 2026-02-07 1:53 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: michaelni
PR #21671 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21671
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21671.patch
Fixes: division by 0
Fixes: 478005965/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5748337088462848
Fixes: 472226169/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-4528777763028992
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From 0b7877102da20f228e67b3ee61175c724520fb00 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 6 Feb 2026 23:44:40 +0100
Subject: [PATCH] avformat/iff: Error out with 0 channel loudspeaker
configuration
Fixes: division by 0
Fixes: 478005965/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5748337088462848
Fixes: 472226169/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-4528777763028992
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 | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavformat/iff.c b/libavformat/iff.c
index fc40ef1aea..8dccd58b35 100644
--- a/libavformat/iff.c
+++ b/libavformat/iff.c
@@ -346,8 +346,10 @@ static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
if (config != 0xFFFF) {
if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))
st->codecpar->ch_layout = dsd_loudspeaker_config[config];
- if (!st->codecpar->ch_layout.nb_channels)
+ if (!st->codecpar->ch_layout.nb_channels) {
avpriv_request_sample(s, "loudspeaker configuration %d", config);
+ return AVERROR_PATCHWELCOME;
+ }
}
break;
}
--
2.52.0
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2026-02-07 1:53 [FFmpeg-devel] [PR] avformat/iff: Error out with 0 channel loudspeaker configuration (PR #21671) michaelni via ffmpeg-devel
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