timers: Fix overflow in get_next_timer_interrupt

commit 34f41c0316ed52b0b44542491d89278efdaa70e4 upstream.

For e.g. HZ=100, timer being 430 jiffies in the future, and 32 bit
unsigned int, there is an overflow on unsigned int right-hand side
of the expression which results with wrong values being returned.

Type cast the multiplier to 64bit to avoid that issue.

Fixes: 46c8f0b077a8 ("timers: Fix get_next_timer_interrupt() computation")
Signed-off-by: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Cc: khilman@baylibre.com
Cc: akpm@linux-foundation.org
Link: http://lkml.kernel.org/r/a7900f04-2a21-c9fd-67be-ab334d459ee5@nokia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index c611c47..944ad64 100644 (file)
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1536,7 +1536,7 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
                base->is_idle = false;
        } else {
                if (!is_max_delta)
-                       expires = basem + (nextevt - basej) * TICK_NSEC;
+                       expires = basem + (u64)(nextevt - basej) * TICK_NSEC;
                /*
                 * If we expect to sleep more than a tick, mark the base idle:
                 */