summaryrefslogtreecommitdiff
path: root/drivers/rtc
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2011-07-26 16:08:19 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-04 21:58:32 -0700
commitec054bbddbd0841174f4d5c3a4685eca9f9a9f93 (patch)
tree9dd215bf9b04bfb69e78c6da3c6f1d33ed62608c /drivers/rtc
parente9c5291ba063473a5560d3387773e9a6997bad65 (diff)
rtc: limit frequency
commit 431e2bcc371016824f419baa745f82388258f3ee upstream. Due to the hrtimer self rearming mode a user can DoS the machine simply because it's starved by hrtimer events. The RTC hrtimer is self rearming. We really need to limit the frequency to something sensible. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ben Greear <greearb@candelatech.com> 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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/interface.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 0900dfea3ae7..3195dbd3ec34 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -708,7 +708,7 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq)
int err = 0;
unsigned long flags;
- if (freq <= 0)
+ if (freq <= 0 || freq > 5000)
return -EINVAL;
retry:
spin_lock_irqsave(&rtc->irq_task_lock, flags);