From: Andrew Ballance <andrewjballance@gmail.com> stable inclusion from stable-v5.15.171 commit e5ae7859008688626b4d2fa6139eeaa08e255053 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB379U CVE: CVE-2024-50247 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 9931122d04c6d431b2c11b5bb7b10f28584067f0 ] A incorrectly formatted chunk may decompress into more than LZNT_CHUNK_SIZE bytes and a index out of bounds will occur in s_max_off. Signed-off-by: Andrew Ballance <andrewjballance@gmail.com> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Zizhi Wo <wozizhi@huawei.com> --- fs/ntfs3/lznt.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ntfs3/lznt.c b/fs/ntfs3/lznt.c index 28f654561f27..09db01c1098c 100644 --- a/fs/ntfs3/lznt.c +++ b/fs/ntfs3/lznt.c @@ -236,6 +236,9 @@ static inline ssize_t decompress_chunk(u8 *unc, u8 *unc_end, const u8 *cmpr, /* Do decompression until pointers are inside range. */ while (up < unc_end && cmpr < cmpr_end) { + // return err if more than LZNT_CHUNK_SIZE bytes are written + if (up - unc > LZNT_CHUNK_SIZE) + return -EINVAL; /* Correct index */ while (unc + s_max_off[index] < up) index += 1; -- 2.46.1