drivers/rtc/rtc-da9052.c: add constraints to set valid year

Signed-off-by: Adam Ward <adam.ward.opensource@diasemi.com>
Tested-by: Adam Ward <adam.ward.opensource@diasemi.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-da9052.c b/drivers/rtc/rtc-da9052.c
index ead02fad2de5..acc3e5a1f61a 100644
--- a/drivers/rtc/rtc-da9052.c
+++ b/drivers/rtc/rtc-da9052.c
@@ -206,6 +206,10 @@ static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
         uint8_t v[6];
         int ret;
 
+        /* DA9052 only has 6 bits for year - to represent 2000-2063 */
+        if ((tm->tm_year < 100) || (tm->tm_year > 163))
+                return -EINVAL;
+
         rtc = dev_get_drvdata(dev);
 
         v[0] = tm->tm_sec;
@@ -243,6 +247,10 @@ static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
         struct rtc_time *tm = &alrm->time;
         struct da9052_rtc *rtc = dev_get_drvdata(dev);
 
+        /* DA9052 only has 6 bits for year - to represent 2000-2063 */
+        if ((tm->tm_year < 100) || (tm->tm_year > 163))
+                return -EINVAL;
+
         ret = da9052_rtc_enable_alarm(rtc, 0);
         if (ret < 0)
                 return ret;