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| author | Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br> | 2011-02-02 16:04:02 -0200 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2011-02-03 12:59:50 -0800 |
| commit | 83a06bf50bdf2074b9404951ff60e142d159d93b (patch) | |
| tree | ebb70cdc221d06529fd327e284f1b9191939f6aa /drivers/rtc/class.c | |
| parent | 9118626a30f8a3f58674623bebd3c34961e558af (diff) | |
| download | lwn-83a06bf50bdf2074b9404951ff60e142d159d93b.tar.gz lwn-83a06bf50bdf2074b9404951ff60e142d159d93b.zip | |
RTC: Prevents a division by zero in kernel code.
This patch prevents a user space program from calling the RTC_IRQP_SET
ioctl with a negative value of frequency. Also, if this call is make
with a zero value of frequency, there would be a division by zero in the
kernel code.
[jstultz: Also initialize irq_freq to 1 to catch other divbyzero issues]
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'drivers/rtc/class.c')
| -rw-r--r-- | drivers/rtc/class.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 9583cbcc6b79..c404b61386bf 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -143,6 +143,7 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev, rtc->id = id; rtc->ops = ops; rtc->owner = owner; + rtc->irq_freq = 1; rtc->max_user_freq = 64; rtc->dev.parent = dev; rtc->dev.class = rtc_class; |