linux-kernel - potential null dereference in sysfs_override

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Message-ID: <alpine.DEB.2.00.0907191545580.12306@bicker>
Date:	Sun, 19 Jul 2009 16:04:48 +0300 (EAT)
From:	Dan Carpenter <error27@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: potential null dereference in sysfs_override_clocksource()

Hello,

I am testing a source checker (http://repo.or.cz/w/smatch.git).

It found an issue in sysfs_override_clocksource() from 
kernel/time/clocksource.c.  If "len" is zero then "ovr" is null and 
checking ovr->flags will oops on line 517.

kernel/time/clocksource.c
   516          if (tick_oneshot_mode_active() &&
   517              !(ovr->flags & CLOCK_SOURCE_VALID_FOR_HRES)) {
   518                  printk(KERN_WARNING "%s clocksource is not HRT compatible. "

regards,
dan carpenter



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