From: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Date: Wed, 2 Feb 2011 18:04:02 +0000 (-0200)
Subject: RTC: Prevents a division by zero in kernel code.
X-Git-Tag: v2.6.38-rc4~10^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83a06bf50bdf2074b9404951ff60e142d159d93b;p=pandora-kernel.git

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>
---

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