From: michaelni <code@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Subject: [FFmpeg-devel] [PATCH] avcodec/jpeg2000dec: Make sure the 4 extra bytes allocated are initialized (PR #20195)
Date: Sat, 9 Aug 2025 15:23:14 +0300 (EEST)
Message-ID: <20250809122314.2B5EC68CFAD@ffbox0-bg.ffmpeg.org> (raw)
PR #20195 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20195
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20195.patch
Fixes: use of uninitialized memory
Fixes: 429130590/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-5736930522497024
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
From 2d67eb718e9d3088c0f575ace40f51e12b3f1acd Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 9 Aug 2025 11:38:07 +0200
Subject: [PATCH] avcodec/jpeg2000dec: Make sure the 4 extra bytes allocated
are initialized
Fixes: use of uninitialized memory
Fixes: 429130590/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-5736930522497024
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 | 1 +
1 file changed, 1 insertion(+)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 59f3133d1f..221ba87305 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1532,6 +1532,7 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
bytestream2_get_bufferu(&s->g, cblk->data + cblk->length, cblk->lengthinc[cwsno]);
cblk->length += cblk->lengthinc[cwsno];
+ memset(cblk->data + cblk->length, 0, 4);
cblk->lengthinc[cwsno] = 0;
if (cblk->nb_terminationsinc) {
cblk->nb_terminationsinc--;
--
2.49.1
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