3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <redacted>

commit e74a8f2edb92cb690b467cea0ab652c509e9f624 upstream.

Commit f44f7f96a20a ("RTC: Initialize kernel state from RTC") introduced a
potential infinite loop.  If an alarm time contains a wildcard month and
an invalid day (> 31), or a wildcard year and an invalid month (>= 12),
the loop searching for the next matching date will never terminate.  Treat
the invalid values as wildcards.

Fixes <http://bugs.debian.org/646429>, <http://bugs.debian.org/653331>

Reported-by: leo weppelman <redacted>
Reported-by: "P. van Gaans" <redacted>
Signed-off-by: Ben Hutchings <redacted>
Signed-off-by: Jonathan Nieder <redacted>
Cc: Mark Brown <redacted>
Cc: Marcelo Roberto Jimenez <redacted>
Cc: Thomas Gleixner <redacted>
Cc: John Stultz <redacted>
Acked-by: Alessandro Zummo <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/rtc/interface.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c

@@ -227,11 +227,11 @@ int __rtc_read_alarm(struct rtc_device *
 		alarm->time.tm_hour = now.tm_hour;
 
 	/* For simplicity, only support date rollover for now */
-	if (alarm->time.tm_mday == -1) {
+	if (alarm->time.tm_mday < 1 || alarm->time.tm_mday > 31) {
 		alarm->time.tm_mday = now.tm_mday;
 		missing = day;
 	}
-	if (alarm->time.tm_mon == -1) {
+	if ((unsigned)alarm->time.tm_mon >= 12) {
 		alarm->time.tm_mon = now.tm_mon;
 		if (missing == none)
 			missing = month;