2.6.25-stable review patch. If anyone has any objections, please let us know. ------------------ From: Maciej W. Rozycki commit 945185a69daa457c4c5e46e47f4afad7dcea734f upstream Date: Mon, 12 May 2008 14:02:24 -0700 Subject: [patch 36/37] rtc: rtc_time_to_tm: use unsigned arithmetic The input argument to rtc_time_to_tm() is unsigned as well as are members of the output structure. However signed arithmetic is used within for calculations leading to incorrect results for input values outside the signed positive range. If this happens the time of day returned is out of range. Found the problem when fiddling with the RTC and the driver where year was set to an unexpectedly large value like 2070, e.g.: rtc0: setting system clock to 2070-01-01 1193046:71582832:26 UTC (3155760954) while it should be: rtc0: setting system clock to 2070-01-01 00:15:54 UTC (3155760954) Changing types to unsigned fixes the problem. [akpm@linux-foundation.org: remove old-fashioned `register' keyword] Signed-off-by: Maciej W. Rozycki Cc: Alessandro Zummo Cc: David Brownell Cc: Dmitri Vorobiev Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- drivers/rtc/rtc-lib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c @@ -51,7 +51,7 @@ EXPORT_SYMBOL(rtc_year_days); */ void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) { - register int days, month, year; + unsigned int days, month, year; days = time / 86400; time -= days * 86400; --