diff options
| author | Marcelo Roberto Jimenez <[email protected]> | 2011-02-02 18:04:02 +0000 |
|---|---|---|
| committer | John Stultz <[email protected]> | 2011-02-03 20:59:50 +0000 |
| commit | 83a06bf50bdf2074b9404951ff60e142d159d93b (patch) | |
| tree | ebb70cdc221d06529fd327e284f1b9191939f6aa /drivers/rtc/class.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rol... (diff) | |
| download | kernel-83a06bf50bdf2074b9404951ff60e142d159d93b.tar.gz kernel-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 <[email protected]>
CC: Thomas Gleixner <[email protected]>
Signed-off-by: Marcelo Roberto Jimenez <[email protected]>
Signed-off-by: John Stultz <[email protected]>
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; |