3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Greg Hackmann <ghackm...@google.com>
Commit ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals") sets a
minimum bound on the alarm timer interval. This minimum bound shouldn't
be applied if the interval is 0. Otherwise, one-shot timers will be
converted into periodic ones.
Fixes: ff86bf0c65f1 ("alarmtimer: Rate limit periodic intervals")
Reported-by: Ben Fennema <fenn...@google.com>
Signed-off-by: Greg Hackmann <ghackm...@google.com>
Cc: sta...@vger.kernel.org
Cc: John Stultz <john.stu...@linaro.org>
Reviewed-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
kernel/time/alarmtimer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -619,7 +619,8 @@ static int alarm_timer_set(struct k_itim
* Rate limit to the tick as a hot fix to prevent DOS. Will be
* mopped up later.
*/
- if (ktime_to_ns(timr->it.alarm.interval) < TICK_NSEC)
+ if (timr->it.alarm.interval.tv64 &&
+ ktime_to_ns(timr->it.alarm.interval) < TICK_NSEC)
timr->it.alarm.interval = ktime_set(0, TICK_NSEC);
exp = timespec_to_ktime(new_setting->it_value);
