linux-kernel - [tip:timers/urgent] time: Fix casting issue in timekeeping_forward

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Date:	Wed, 22 Aug 2012 01:51:09 -0700
From:	tip-bot for Andreas Schwab <schwab@...ux-m68k.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, john.stultz@...aro.org,
	hpa@...or.com, mingo@...nel.org, schwab@...ux-m68k.org,
	tglx@...utronix.de, prarit@...hat.com
Subject: [tip:timers/urgent] time:
  Fix casting issue in timekeeping_forward_now

Commit-ID:  85dc8f05c93c8105987de9d7e7cebf15a72ff4ec
Gitweb:     http://git.kernel.org/tip/85dc8f05c93c8105987de9d7e7cebf15a72ff4ec
Author:     Andreas Schwab <schwab@...ux-m68k.org>
AuthorDate: Tue, 21 Aug 2012 20:30:47 -0400
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 22 Aug 2012 10:42:13 +0200

time: Fix casting issue in timekeeping_forward_now

arch_gettimeoffset returns a u32 value which when shifted by tk->shift
can overflow. This issue was introduced with 1e75fa8be (time: Condense
timekeeper.xtime into xtime_sec)

Cast it to u64 first.

Signed-off-by: Andreas Schwab <schwab@...ux-m68k.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Link: http://lkml.kernel.org/r/1345595449-34965-3-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/timekeeping.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

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);
 
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