diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2012-01-10 15:11:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-10 16:30:53 -0800 |
| commit | e74a8f2edb92cb690b467cea0ab652c509e9f624 (patch) | |
| tree | 346aa7fc0b5d6ad1d52c8fc1de883fb085d94daa /drivers | |
| parent | 948170f8944dfd29d13612fff48110a9814daeb1 (diff) | |
drivers/rtc/interface.c: fix alarm rollover when day or month is out-of-range
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 <leoweppelman@googlemail.com>
Reported-by: "P. van Gaans" <mailme667@yahoo.co.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rtc/interface.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 8e286259a00..8a1c031391d 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -228,11 +228,11 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) 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; |