linux-kernel - [PATCH 2/4] time: Fix casting issue in timekeeping_forward

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Message-Id: <1345595449-34965-3-git-send-email-john.stultz@linaro.org>
Date:	Tue, 21 Aug 2012 20:30:47 -0400
From:	John Stultz <john.stultz@...aro.org>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Andreas Schwab <schwab@...ux-m68k.org>,
	Ingo Molnar <mingo@...nel.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 2/4] time: Fix casting issue in timekeeping_forward_now

From: Andreas Schwab <schwab@...ux-m68k.org>

arch_gettimeoffset returns a u32 value which when shifted by tk->shift can
overflow.  Cast it to u64 first.

This issue was introduced with 1e75fa8be9fb61e1af46b5b3b176347a4c958ca1

Cc: Ingo Molnar <mingo@...nel.org>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Andreas Schwab <schwab@...ux-m68k.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/timekeeping.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 258164a..1dbf80e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -277,7 +277,7 @@ static void timekeeping_forward_now(struct timekeeper *tk)
 	tk->xtime_nsec += cycle_delta * tk->mult;
 
 	/* If arch requires, add in gettimeoffset() */
-	tk->xtime_nsec += arch_gettimeoffset() << tk->shift;
+	tk->xtime_nsec += (u64)arch_gettimeoffset() << tk->shift;
 
 	tk_normalize_xtime(tk);
 
-- 
1.7.9.5

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