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 <[email protected]> Signed-off-by: Jan Kara <[email protected]>
thoughtpolice · Dec 19, 2017 · d5bd821 · d5bd821
1 parent 1291a0d
commit d5bd821
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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;
 }