From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 19 Jul 2009 15:09:12 +0000 (+0200)
Subject: clocksource: Prevent NULL pointer dereference
X-Git-Tag: v2.6.31-rc4~5^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79ef2bb01445400def20c7993b27fbcad27ca95f;p=pandora-kernel.git

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>
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