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=...

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[ 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;