udf: Sanitize nanoseconds for time stamps

Reportedly some UDF filesystems are recorded with bogus subsecond values
resulting in nanoseconds being over 10^9. Sanitize nanoseconds in time
stamps when loading them from disk.

Reported-by: Ian Turner <vectro@vectro.org>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c
index 14626b34d13e42764cc31eb74941eb89a5910e33..0927a4b2ecafba09171d62adf90edd13b791b668 100644 (file)
--- a/fs/udf/udftime.c
+++ b/fs/udf/udftime.c
@@ -62,6 +62,11 @@ udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src)
        dest->tv_sec -= offset * 60;
        dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
                        src.hundredsOfMicroseconds * 100 + src.microseconds);
+       /*
+        * Sanitize nanosecond field since reportedly some filesystems are
+        * recorded with bogus sub-second values.
+        */
+       dest->tv_nsec %= NSEC_PER_SEC;
        return dest;
 }