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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>
This commit is contained in:
Jan Kara 2017-12-19 08:11:01 +01:00
parent 1291a0d504
commit d5bd821350
1 changed files with 5 additions and 0 deletions
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5
fs/udf/udftime.c
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@ -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;
}