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fs/ntfs3: Support timestamps prior to epoch

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[ Upstream commit 5180138604323895b5c291eca6aa7c20be494ade ]

Before it used an unsigned 64-bit type, which prevented proper handling
of timestamps earlier than 1970-01-01. Switch to a signed 64-bit type to
support pre-epoch timestamps. The issue was caught by xfstests.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Konstantin Komarov
2025-09-01 11:48:48 +03:00
committed by Greg Kroah-Hartman
parent fefb29d64e
commit f5c2a7cb2f
1 changed files with 5 additions and 4 deletions
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9
fs/ntfs3/ntfs_fs.h
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@@ -990,11 +990,12 @@ static inline __le64 kernel2nt(const struct timespec64 *ts)
*/
static inline void nt2kernel(const __le64 tm, struct timespec64 *ts)
{
u64 t = le64_to_cpu(tm) - _100ns2seconds * SecondsToStartOf1970;
s32 t32;
/* use signed 64 bit to support timestamps prior to epoch. xfstest 258. */
s64 t = le64_to_cpu(tm) - _100ns2seconds * SecondsToStartOf1970;
// WARNING: do_div changes its first argument(!)
ts->tv_nsec = do_div(t, _100ns2seconds) * 100;
ts->tv_sec = t;
ts->tv_sec = div_s64_rem(t, _100ns2seconds, &t32);
ts->tv_nsec = t32 * 100;
}
static inline struct ntfs_sb_info *ntfs_sb(struct super_block *sb)