clockevents: warn once when program_event() is called with negative expiry

The hrtimer problem with large relative timeouts resulting in a
negative expiry time went unnoticed as there is no check in the
clockevents_program_event() code. Put a check there with a WARN_ONCE
to avoid such problems in the future.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 822beebe66..5fb139fef9 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -78,6 +78,11 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
         unsigned long long clc;
         int64_t delta;
 
+        if (unlikely(expires.tv64 < 0)) {
+                WARN_ON_ONCE(1);
+                return -ETIME;
+        }
+
         delta = ktime_to_ns(ktime_sub(expires, now));
 
         if (delta <= 0)