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authorGreg Hackmann <ghackmann@google.com>2017-07-24 10:19:24 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-27 15:06:10 -0700
commit9c839d00dc1be48582ea2057567391e5520db635 (patch)
parentbb8109a9ca87f4b02a96002efabc30396ebe8eb5 (diff)
alarmtimer: don't rate limit one-shot timers
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 <fennema@google.com> Signed-off-by: Greg Hackmann <ghackmann@google.com> Cc: stable@vger.kernel.org Cc: John Stultz <john.stultz@linaro.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 2c3a23d77704..6fcc367ad531 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -616,7 +616,8 @@ static int alarm_timer_set(struct k_itimer *timr, int flags,
* 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);