[PATCH 5.4 29/62] exfat: Month timestamp metadata accidentally incremented

Greg Kroah-Hartman
2021-01-15T12:35:37Z

From: "Valdis Klētnieks" <valdis.kletnieks@vt.edu>

The staging/exfat driver has departed, but a lot of distros are still tracking
5.4-stable, so we should fix this.

There was an 0/1 offset error in month handling for file metadata, causing
the month to get incremented on each reference to the file.

Thanks to Sebastian Gurtler for troubleshooting this, and Arpad Mueller
for bringing it to my attention.

Relevant discussions:
https://bugzilla.kernel.org/show_bug.cgi?id=210997
https://bugs.launchpad.net/ubuntu/+source/ubuntu-meta/+bug/1872504

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/exfat/exfat_super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/exfat/exfat_super.c
+++ b/drivers/staging/exfat/exfat_super.c
@@ -59,7 +59,7 @@ static void exfat_write_super(struct sup
/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
static void exfat_time_fat2unix(struct timespec64 *ts, struct date_time_t *tp)
{
- ts->tv_sec = mktime64(tp->Year + 1980, tp->Month + 1, tp->Day,
+ ts->tv_sec = mktime64(tp->Year + 1980, tp->Month, tp->Day,
tp->Hour, tp->Minute, tp->Second);

ts->tv_nsec = tp->MilliSecond * NSEC_PER_MSEC;