From: michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: michaelni <code@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH] avcodec/jpeg2000dec: Make M_b check broader (PR #21273)
Date: Tue, 23 Dec 2025 02:15:43 -0000
Message-ID: <176645614445.60.7196724917148516034@2cb04c0e5124> (raw)
PR #21273 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21273
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21273.patch
Fixes: shift exponent -1 is negative
Fixes: 429330004/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-4733213845291008
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From 4b7bf41ff0d77bccad4ffea7f4dfbc438bcfbc14 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 22 Dec 2025 23:17:24 +0100
Subject: [PATCH] avcodec/jpeg2000dec: Make M_b check broader
Fixes: shift exponent -1 is negative
Fixes: 429330004/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-4733213845291008
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/jpeg2000dec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index de1a73b92b..276c0a6e43 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -2270,8 +2270,8 @@ static inline int tile_codeblocks(const Jpeg2000DecoderContext *s, Jpeg2000Tile
band->coord[1][0] == band->coord[1][1])
continue;
- if ((codsty->cblk_style & JPEG2000_CTSY_HTJ2K_F) && M_b >= 31) {
- avpriv_request_sample(s->avctx, "JPEG2000_CTSY_HTJ2K_F and M_b >= 31");
+ if (M_b >= 31) {
+ avpriv_request_sample(s->avctx, "M_b >= 31");
return AVERROR_PATCHWELCOME;
}
--
2.49.1
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