[PATCH v3 2/7] thermal: thermal_of: Stop zone device before unregistering it

Dmitry Osipenko
2021-05-29T17:10:52Z

Zone device is enabled after thermal_zone_of_sensor_register() completion,
but it's not disabled before senors if unregistered, leaving temperature
polling active. This results in accessing a disabled zone device and
produces a warning about this problem. Stop zone device before
unregistering it in order to fix this "use-after-free" problem.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/thermal/thermal_of.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 5b76f9a1280d..6379f26a335f 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -559,6 +559,9 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
if (!tz)
return;

+ /* stop temperature polling */
+ thermal_zone_device_disable(tzd);
+
mutex_lock(&tzd->lock);
tzd->ops->get_temp = NULL;
tzd->ops->get_trend = NULL;
--
2.30.2