timekeeping: Cast raw_interval to u64 to avoid shift overflow

We fixed a bunch of integer overflows in timekeeping code during the 3.6
cycle.  I did an audit based on that and found this potential overflow.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: John Stultz <johnstul@us.ibm.com>
Link: http://lkml.kernel.org/r/20121009071823.GA19159@elgon.mountain
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 16280ff3cf82..3eb3fc7c1600 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1045,7 +1045,7 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
         accumulate_nsecs_to_secs(tk);
 
         /* Accumulate raw time */
-        raw_nsecs = tk->raw_interval << shift;
+        raw_nsecs = (u64)tk->raw_interval << shift;
         raw_nsecs += tk->raw_time.tv_nsec;
         if (raw_nsecs >= NSEC_PER_SEC) {
                 u64 raw_secs = raw_nsecs;