From: lei lu llfamsec@gmail.com

mainline inclusion from mainline-v6.10-rc1 commit 50c47879650b4c97836a0086632b3a2e300b0f06 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAG8RW CVE: CVE-2024-41019

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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This adds sanity checks for ff offset. There is a check on rt->first_free at first, but walking through by ff without any check. If the second ff is a large offset. We may encounter an out-of-bound read.

Signed-off-by: lei lu llfamsec@gmail.com Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Wang Zhaolong wangzhaolong1@huawei.com --- fs/ntfs3/fslog.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c index 6489953d4617..301cfbda5cd4 100644 --- a/fs/ntfs3/fslog.c +++ b/fs/ntfs3/fslog.c @@ -722,7 +722,8 @@ static bool check_rstbl(const struct RESTART_TABLE *rt, size_t bytes)

if (!rsize || rsize > bytes || rsize + sizeof(struct RESTART_TABLE) > bytes || bytes < ts || - le16_to_cpu(rt->total) > ne || ff > ts || lf > ts || + le16_to_cpu(rt->total) > ne || + ff > ts - sizeof(__le32) || lf > ts - sizeof(__le32) || (ff && ff < sizeof(struct RESTART_TABLE)) || (lf && lf < sizeof(struct RESTART_TABLE))) { return false; @@ -752,6 +753,9 @@ static bool check_rstbl(const struct RESTART_TABLE *rt, size_t bytes) return false;

off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off)); + + if (off > ts - sizeof(__le32)) + return false; }

return true;