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Thermal: Check for validity before doing kfree

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The thermal_release function is called whenever
any device belonging to 'thermal' class unregisters.
This function performs kfree(cdev) without any check.
In cases where there are more device registrations
other than just 'thermal_zone' and 'cooling_device'
this might accidently free memory allocated them
silently; and cause memory errors.

This patch changes this behavior by doing
kfree(cdev) only when the device pointer belongs
to a real cdev i.e. cooling_device.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
durgadoss.r@intel.com 2013-10-02 00:08:00 +05:30 committed by Zhang Rui
parent a822794886
commit 732e4c8db9
1 changed files with 2 additions and 1 deletions
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3
drivers/thermal/thermal_core.c
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@ -1038,7 +1038,8 @@ static void thermal_release(struct device *dev)
sizeof("thermal_zone") - 1)) { sizeof("thermal_zone") - 1)) {
tz = to_thermal_zone(dev); tz = to_thermal_zone(dev);
kfree(tz); kfree(tz);
} else { } else if(!strncmp(dev_name(dev), "cooling_device",
sizeof("cooling_device") - 1)){
cdev = to_cooling_device(dev); cdev = to_cooling_device(dev);
kfree(cdev); kfree(cdev);
} }