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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fc0f8188sm138816905e9.2.2026.04.18.06.11.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Apr 2026 06:11:18 -0700 (PDT) From: Tristan Madani 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 Message-ID: <20260418131118.1063963-1-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Tristan Madani 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 --- 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 +=3D 1; =20 /* Check the current flag for zero. */ --=20 2.47.3