linux-kernel - [PATCH 1/3] alarmtimers: Avoid possible null pointer traversal

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Date:	Wed, 10 Aug 2011 16:43:34 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>, stable@...nel.org
Subject: [PATCH 1/3] alarmtimers: Avoid possible null pointer traversal

We don't check if old_setting is non null before assigning it, so
correct this.

CC: Thomas Gleixner <tglx@...utronix.de>
CC: stable@...nel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/alarmtimer.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 59f369f..1dee3f6 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -479,11 +479,8 @@ static int alarm_timer_set(struct k_itimer *timr, int flags,
 	if (!rtcdev)
 		return -ENOTSUPP;
 
-	/* Save old values */
-	old_setting->it_interval =
-			ktime_to_timespec(timr->it.alarmtimer.period);
-	old_setting->it_value =
-			ktime_to_timespec(timr->it.alarmtimer.node.expires);
+	if (old_setting)
+		alarm_timer_get(timr, old_setting);
 
 	/* If the timer was already set, cancel it */
 	alarm_cancel(&timr->it.alarmtimer);
-- 
1.7.3.2.146.gca209

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