* [FFmpeg-devel] [PATCH] avcodec/jpeg2000htdec: Check pLSB (PR #21271)
@ 2025-12-23 2:08 michaelni via ffmpeg-devel
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From: michaelni via ffmpeg-devel @ 2025-12-23 2:08 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: michaelni
PR #21271 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21271
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21271.patch
Fixes: negative shift and other undefined shifts
Fixes: 462335934/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-4538493775970304
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From 466447b98980e328674719449ce7b7d1b225641a Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 22 Dec 2025 22:56:10 +0100
Subject: [PATCH] avcodec/jpeg2000htdec: Check pLSB
Fixes: negative shift and other undefined shifts
Fixes: 462335934/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-4538493775970304
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/jpeg2000htdec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/jpeg2000htdec.c b/libavcodec/jpeg2000htdec.c
index 08140e06a9..54b37009c2 100644
--- a/libavcodec/jpeg2000htdec.c
+++ b/libavcodec/jpeg2000htdec.c
@@ -1263,6 +1263,11 @@ ff_jpeg2000_decode_htj2k(const Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c
cblk->zbp = S_blk - 1;
pLSB = 30 - S_blk;
+ if (pLSB <= 1 || pLSB >= 31) {
+ avpriv_request_sample(s->avctx, "pLSB %d", pLSB);
+ return AVERROR_PATCHWELCOME;
+ }
+
Scup = (Dcup[Lcup - 1] << 4) + (Dcup[Lcup - 2] & 0x0F);
if (Scup < 2 || Scup > Lcup || Scup > 4079) {
--
2.49.1
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2025-12-23 2:08 [FFmpeg-devel] [PATCH] avcodec/jpeg2000htdec: Check pLSB (PR #21271) michaelni via ffmpeg-devel
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