diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2009-07-19 11:09:12 -0400 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2009-07-19 11:15:54 -0400 |
commit | 79ef2bb01445400def20c7993b27fbcad27ca95f (patch) | |
tree | 2b4941a2b4a6822dd0f50f13ff04e9e0a369878e /kernel | |
parent | 4841158b26e28e1476eed84c7347c18f11317750 (diff) |
clocksource: Prevent NULL pointer dereference
Writing a zero length string to sys/.../current_clocksource will cause
a NULL pointer dereference if the clock events system is in one shot
(highres or nohz) mode.
Pointed-out-by: Dan Carpenter <error27@gmail.com>
LKML-Reference: <alpine.DEB.2.00.0907191545580.12306@bicker>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/time/clocksource.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 592bf584d1d2..7466cb811251 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c | |||
@@ -513,7 +513,7 @@ static ssize_t sysfs_override_clocksource(struct sys_device *dev, | |||
513 | * Check to make sure we don't switch to a non-highres capable | 513 | * Check to make sure we don't switch to a non-highres capable |
514 | * clocksource if the tick code is in oneshot mode (highres or nohz) | 514 | * clocksource if the tick code is in oneshot mode (highres or nohz) |
515 | */ | 515 | */ |
516 | if (tick_oneshot_mode_active() && | 516 | if (tick_oneshot_mode_active() && ovr && |
517 | !(ovr->flags & CLOCK_SOURCE_VALID_FOR_HRES)) { | 517 | !(ovr->flags & CLOCK_SOURCE_VALID_FOR_HRES)) { |
518 | printk(KERN_WARNING "%s clocksource is not HRT compatible. " | 518 | printk(KERN_WARNING "%s clocksource is not HRT compatible. " |
519 | "Cannot switch while in HRT/NOHZ mode\n", ovr->name); | 519 | "Cannot switch while in HRT/NOHZ mode\n", ovr->name); |