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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-07-19 17:09:12 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-07-19 17:15:54 +0200 |
| commit | 79ef2bb01445400def20c7993b27fbcad27ca95f (patch) | |
| tree | 2b4941a2b4a6822dd0f50f13ff04e9e0a369878e | |
| parent | timer: Avoid reading uninitialized data (diff) | |
| download | linux-79ef2bb01445400def20c7993b27fbcad27ca95f.tar.xz linux-79ef2bb01445400def20c7993b27fbcad27ca95f.zip | |
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>
| -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, * Check to make sure we don't switch to a non-highres capable * clocksource if the tick code is in oneshot mode (highres or nohz) */ - if (tick_oneshot_mode_active() && + if (tick_oneshot_mode_active() && ovr && !(ovr->flags & CLOCK_SOURCE_VALID_FOR_HRES)) { printk(KERN_WARNING "%s clocksource is not HRT compatible. " "Cannot switch while in HRT/NOHZ mode\n", ovr->name); |