linux-kernel - [PATCH 5.10 077/125] thermal/core/thermal_of: Stop zone device before unregistering it

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Date:   Thu, 22 Jul 2021 18:31:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 077/125] thermal/core/thermal_of: Stop zone device before unregistering it

From: Dmitry Osipenko <digetx@...il.com>

[ Upstream commit 5e5c9f9a75fc4532980c2e699caf8a36070a3a2e ]

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@...il.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20210616190417.32214-3-digetx@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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