linux-kernel - RE: [ASAP] thermal_sys.c NULL ptr deref patch likely incomplete

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Date:	Fri, 15 Feb 2013 08:34:07 +0000
From:	"Zhang, Rui" <rui.zhang@...el.com>
To:	Andreas Mohr <andi@...as.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [ASAP] thermal_sys.c NULL ptr deref patch likely incomplete

Can you please attach your config file?

Thanks,
rui

> -----Original Message-----
> From: Andreas Mohr [mailto:andi@...as.de]
> Sent: Thursday, February 14, 2013 10:44 PM
> To: Zhang, Rui
> Cc: linux-kernel@...r.kernel.org
> Subject: [ASAP] thermal_sys.c NULL ptr deref patch likely incomplete
> Importance: High
> 
> Hi,
> 
> I just had a
> 
> # cat /sys/class/thermal/thermal_zone0/policy
> (null)
> 
> 
> When looking at the code (on my -rc7), I saw:
> 
> drivers/thermal/thermal_sys.c
> 
> static ssize_t
> policy_show(struct device *dev, struct device_attribute *devattr, char
> *buf)
> {
>         struct thermal_zone_device *tz = to_thermal_zone(dev);
> 
>         return sprintf(buf, "%s\n", tz->governor->name);
> }
> 
> 
> (not sure though why I manage to get a "(null)" rather than a crash
> due to the dereferencing prior to output - possibly since I do have a
> valid governor allocated yet then only its name field is null?)
> 
> 
> Seems we are missing a critical (and -rc-relevant) patch here
> (and perhaps at other locations in this file, too, given that
> this one was missed last time?).
> 
> Currently trying to get acerhdf operation into a working state
> (and having some trouble with it - didn't know that I probably need
> some
> governor setup which seems to have just been available on my last setup,
> or so)
> 
> Thanks,
> 
> Andreas Mohr
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