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authorGabriele Mazzotta <gabriele.mzt@gmail.com>2016-10-04 00:50:28 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2016-10-19 09:41:43 +0200
commit6a6af3d04435adfdaab363624ec569a9b5d3973c (patch)
treec354c40eb8ec34e6f2b1d0983839258be769eddb /drivers/rtc
parent1001354ca34179f3db924eb66672442a173147dc (diff)
downloadlinux-6a6af3d04435adfdaab363624ec569a9b5d3973c.tar.bz2
rtc: cmos: Reject unsupported alarm values
Some platforms allows to specify the month and day of the month in which an alarm should go off, some others the day of the month and some others just the time. Currently any given value is accepted by the driver and only the supported fields are used to program the hardware. As consequence, alarms are potentially programmed to go off in the wrong moment. Fix this by rejecting any unsupported value. Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-cmos.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index dd3d59806ffa..903a82ae83f0 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -325,14 +325,86 @@ static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask)
cmos_checkintr(cmos, rtc_control);
}
+static int cmos_validate_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ struct rtc_time now;
+
+ cmos_read_time(dev, &now);
+
+ if (!cmos->day_alrm) {
+ time64_t t_max_date;
+ time64_t t_alrm;
+
+ t_max_date = rtc_tm_to_time64(&now);
+ t_max_date += 24 * 60 * 60 - 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one day in the future\n");
+ return -EINVAL;
+ }
+ } else if (!cmos->mon_alrm) {
+ struct rtc_time max_date = now;
+ time64_t t_max_date;
+ time64_t t_alrm;
+ int max_mday;
+
+ if (max_date.tm_mon == 11) {
+ max_date.tm_mon = 0;
+ max_date.tm_year += 1;
+ } else {
+ max_date.tm_mon += 1;
+ }
+ max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year);
+ if (max_date.tm_mday > max_mday)
+ max_date.tm_mday = max_mday;
+
+ t_max_date = rtc_tm_to_time64(&max_date);
+ t_max_date -= 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one month in the future\n");
+ return -EINVAL;
+ }
+ } else {
+ struct rtc_time max_date = now;
+ time64_t t_max_date;
+ time64_t t_alrm;
+ int max_mday;
+
+ max_date.tm_year += 1;
+ max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year);
+ if (max_date.tm_mday > max_mday)
+ max_date.tm_mday = max_mday;
+
+ t_max_date = rtc_tm_to_time64(&max_date);
+ t_max_date -= 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one year in the future\n");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char mon, mday, hrs, min, sec, rtc_control;
+ int ret;
if (!is_valid_irq(cmos->irq))
return -EIO;
+ ret = cmos_validate_alarm(dev, t);
+ if (ret < 0)
+ return ret;
+
mon = t->time.tm_mon + 1;
mday = t->time.tm_mday;
hrs = t->time.tm_hour;