thermal/core/thermal_of: Stop zone device before unregistering it

Zone device is enabled after thermal_zone_of_sensor_register() completion,
but it's not disabled before senor is 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>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210616190417.32214-3-digetx@gmail.com

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 5b76f9a1280d55dc37da0a51f66b1cef3fed6f9c..6379f26a335f64c1e854cfd0cb45d58c3a2b6d3e 100644 (file)
--- 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;