drivers/rtc/interface.c: fix infinite loop in initializing the alarm

In __rtc_read_alarm(), if the alarm time retrieved by
rtc_read_alarm_internal() from the device contains invalid values (e.g.
month=2,mday=31) and the year not set (=-1), the initialization will
loop infinitely because the year-fixing loop expects the time being
invalid due to leap year.

Fix reduces the loop to the leap years and adds final validity check.

Signed-off-by: Ales Novak <alnovak@suse.cz>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Reported-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index c2eff6082363..5813fa52c3d4 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -292,7 +292,8 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
                 dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year");
                 do {
                         alarm->time.tm_year++;
-                } while (rtc_valid_tm(&alarm->time) != 0);
+                } while (!is_leap_year(alarm->time.tm_year + 1900)
+                        && rtc_valid_tm(&alarm->time) != 0);
                 break;
 
         default:
@@ -300,7 +301,16 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
         }
 
 done:
-        return 0;
+        err = rtc_valid_tm(&alarm->time);
+
+        if (err) {
+                dev_warn(&rtc->dev, "invalid alarm value: %d-%d-%d %d:%d:%d\n",
+                        alarm->time.tm_year + 1900, alarm->time.tm_mon + 1,
+                        alarm->time.tm_mday, alarm->time.tm_hour, alarm->time.tm_min,
+                        alarm->time.tm_sec);
+        }
+
+        return err;
 }
 
 int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)