From: michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: michaelni <code@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH] avcodec/adpcm: check block_align for PSXC (PR #21268)
Date: Mon, 22 Dec 2025 17:38:37 -0000
Message-ID: <176642511811.60.13171508956822035714@2cb04c0e5124> (raw)
PR #21268 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21268
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21268.patch
Fixes: division by 0
Fixes: 457634826/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_PSXC_DEC_fuzzer-4903668521697280
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From e965801a0e13f16829be67708618c145748ff5b8 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 22 Dec 2025 18:30:52 +0100
Subject: [PATCH] avcodec/adpcm: check block_align for PSXC
Fixes: division by 0
Fixes: 457634826/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_PSXC_DEC_fuzzer-4903668521697280
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/adpcm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 72fbb841a4..3da0791ba3 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -294,7 +294,7 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
break;
case AV_CODEC_ID_ADPCM_PSXC:
max_channels = 8;
- if (avctx->ch_layout.nb_channels <= 0)
+ if (avctx->ch_layout.nb_channels <= 0 || avctx->block_align <= 0)
return AVERROR_INVALIDDATA;
break;
case AV_CODEC_ID_ADPCM_IMA_DAT4:
--
2.49.1
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