From: Tristan Madani <tristmd@gmail.com>
To: almaz.alexandrovich@paragon-software.com
Cc: ntfs3@lists.linux.dev, linux-kernel@vger.kernel.org,
syzbot+39b2fb0f2638669008ec@syzkaller.appspotmail.com
Subject: [PATCH] ntfs3: fix out-of-bounds read in decompress_lznt
Date: Sat, 18 Apr 2026 13:11:18 +0000 [thread overview]
Message-ID: <20260418131118.1063963-1-tristmd@gmail.com> (raw)
From: Tristan Madani <tristan@talencesecurity.com>
decompress_lznt() does not validate array index bounds before accessing
the decompression table. A corrupted NTFS3 image with invalid compressed
data can trigger an out-of-bounds read.
Add index bounds checking to prevent the OOB access.
Reported-by: syzbot+39b2fb0f2638669008ec@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Tristan Madani <tristan@talencesecurity.com>
---
fs/ntfs3/lznt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ntfs3/lznt.c b/fs/ntfs3/lznt.c
index fdc9b2ebf3410..f818d97850049 100644
--- a/fs/ntfs3/lznt.c
+++ b/fs/ntfs3/lznt.c
@@ -240,7 +240,7 @@ static inline ssize_t decompress_chunk(u8 *unc, u8 *unc_end, const u8 *cmpr,
if (up - unc > LZNT_CHUNK_SIZE)
return -EINVAL;
/* Correct index */
- while (unc + s_max_off[index] < up)
+ while (index < ARRAY_SIZE(s_max_off) - 1 && unc + s_max_off[index] < up)
index += 1;
/* Check the current flag for zero. */
--
2.47.3
next reply other threads:[~2026-04-18 13:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-18 13:11 Tristan Madani [this message]
2026-04-30 12:00 ` [PATCH] ntfs3: fix out-of-bounds read in decompress_lznt Konstantin Komarov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260418131118.1063963-1-tristmd@gmail.com \
--to=tristmd@gmail.com \
--cc=almaz.alexandrovich@paragon-software.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ntfs3@lists.linux.dev \
--cc=syzbot+39b2fb0f2638669008ec@syzkaller.appspotmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox