* [FFmpeg-devel] [PR] avcodec/jpeg2000dec: fix integer overflow in dequantization_int_97() (PR #22242)
@ 2026-02-21 21:26 michaelni via ffmpeg-devel
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From: michaelni via ffmpeg-devel @ 2026-02-21 21:26 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: michaelni
PR #22242 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22242
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22242.patch
Fixes: signed integer overflow: 2147483640 + 32 cannot be represented in type 'int'
Fixes: 473569764/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-5377306970619904
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From b7d96eb662d9c2b455d7b625f9c7830689820787 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 21 Feb 2026 01:42:31 +0100
Subject: [PATCH] avcodec/jpeg2000dec: fix integer overflow in
dequantization_int_97()
Fixes: signed integer overflow: 2147483640 + 32 cannot be represented in type 'int'
Fixes: 473569764/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-5377306970619904
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 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 017be6f025..99c9bf7125 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -2201,7 +2201,7 @@ static void dequantization_int_97(int x, int y, Jpeg2000Cblk *cblk,
if (val < 0) // Convert sign-magnitude to two's complement
val = -(val & INT32_MAX);
// Shifting down to prevent overflow in dequantization
- val = (val + (1 << (PRESCALE - 1))) >> PRESCALE;
+ val = (val + (1LL << (PRESCALE - 1))) >> PRESCALE;
datap[i] = RSHIFT(val * (int64_t)band->i_stepsize, 16);
}
}
--
2.52.0
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2026-02-21 21:26 [FFmpeg-devel] [PR] avcodec/jpeg2000dec: fix integer overflow in dequantization_int_97() (PR #22242) michaelni via ffmpeg-devel
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