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thermal: core: Fix use-after-free in thermal_zone_device_unregister()

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The user-after-free bug in thermal_zone_device_unregister() is reported by
KASAN. It happens because struct thermal_zone_device is released during of
device_unregister() invocation, and hence the "tz" variable shouldn't be
touched by thermal_notify_tz_delete(tz->id).

Fixes: 55cdf0a283 ("thermal: core: Add notifications call in the framework")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200817235854.26816-1-digetx@gmail.com
This commit is contained in:
Dmitry Osipenko 2020-08-18 02:58:54 +03:00 committed by Daniel Lezcano
parent 0ffdab6f2d
commit a5f785ce60
1 changed files with 3 additions and 2 deletions
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5
drivers/thermal/thermal_core.c
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@ -1516,7 +1516,7 @@ EXPORT_SYMBOL_GPL(thermal_zone_device_register);
*/
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
{
int i;
int i, tz_id;
const struct thermal_zone_params *tzp;
struct thermal_cooling_device *cdev;
struct thermal_zone_device *pos = NULL;
@ -1525,6 +1525,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
return;
tzp = tz->tzp;
tz_id = tz->id;
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node)
@ -1567,7 +1568,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
mutex_destroy(&tz->lock);
device_unregister(&tz->device);
thermal_notify_tz_delete(tz->id);
thermal_notify_tz_delete(tz_id);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);