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authorMarcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>2011-02-02 21:04:02 +0300
committerJohn Stultz <john.stultz@linaro.org>2011-02-03 23:59:50 +0300
commit83a06bf50bdf2074b9404951ff60e142d159d93b (patch)
treeebb70cdc221d06529fd327e284f1b9191939f6aa /drivers/rtc/class.c
parent9118626a30f8a3f58674623bebd3c34961e558af (diff)
downloadlinux-83a06bf50bdf2074b9404951ff60e142d159d93b.tar.xz
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.c1
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;