[PATCH] timer: prevent overflow in apply_slack

[Jiri Bohac]

Prevent overflow in the computation of timer expiry time inside
apply_slack().

Signed-off-by: Jiri Bohac <jbohac@xxxxxxx>
Suggested-by: Deborah Townsend <dstownse@xxxxxxxxxx>

diff --git a/kernel/timer.c b/kernel/timer.c
index 87bd529..4c36c91 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -838,7 +838,7 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
 
 	bit = find_last_bit(&mask, BITS_PER_LONG);
 
-	mask = (1 << bit) - 1;
+	mask = (1LL << bit) - 1;
 
 	expires_limit = expires_limit & ~(mask);
 
-- 
Jiri Bohac <jbohac@xxxxxxx>
SUSE Labs, SUSE CZ

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