svn commit: r275727 - head/sys/kern

[Konstantin Belousov]

Author: kib
Date: Fri Dec 12 09:37:18 2014
New Revision: 275727
URL: https://svnweb.freebsd.org/changeset/base/275727

Log:
  For architectures where time_t is wide enough, in particular, 64bit
  platforms, avoid overflow after year 2038 in clock_ct_to_ts().
  
  PR:	195868
  Reviewed by:	bde
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/kern/subr_clock.c

Modified: head/sys/kern/subr_clock.c
==============================================================================
--- head/sys/kern/subr_clock.c	Fri Dec 12 09:22:52 2014	(r275726)
+++ head/sys/kern/subr_clock.c	Fri Dec 12 09:37:18 2014	(r275727)
@@ -133,7 +133,6 @@ print_ct(struct clocktime *ct)
 int
 clock_ct_to_ts(struct clocktime *ct, struct timespec *ts)
 {
-	time_t secs;
 	int i, year, days;
 
 	year = ct->year;
@@ -167,11 +166,10 @@ clock_ct_to_ts(struct clocktime *ct, str
 	  	days += days_in_month(year, i);
 	days += (ct->day - 1);
 
-	/* Add hours, minutes, seconds. */
-	secs = ((days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec;
-
-	ts->tv_sec = secs;
+	ts->tv_sec = (((time_t)days * 24 + ct->hour) * 60 + ct->min) * 60 +
+	    ct->sec;
 	ts->tv_nsec = ct->nsec;
+
 	if (ct_debug)
 		printf(" = %ld.%09ld\n", (long)ts->tv_sec, (long)ts->tv_nsec);
 	return (0);