linux-kernel - [PATCH -next] thermal/drivers/thermal_hwmon: Fix a kernel NULL pointer dereference

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Message-Id: <20230329090055.7537-1-rui.zhang@intel.com>
Date:   Wed, 29 Mar 2023 17:00:55 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     linux-pm@...r.kernel.org, rafael.j.wysocki@...el.com,
        daniel.lezcano@...aro.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH -next] thermal/drivers/thermal_hwmon: Fix a kernel NULL pointer dereference

When the hwmon device node of a thermal zone device is not found,
using hwmon->device causes a kernel NULL pointer dereference.

Reported-by: Preble Adam C <adam.c.preble@...el.com>
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
Fixes: dec07d399cc8 ("thermal: Don't use 'device' internal thermal zone structure field")
dec07d399cc8 is a commit in the linux-next branch of linux-pm repo.
I'm not sure if the Fix tag applies to such commit or not.
---
 drivers/thermal/thermal_hwmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
index c59db17dddd6..261743f461be 100644
--- a/drivers/thermal/thermal_hwmon.c
+++ b/drivers/thermal/thermal_hwmon.c
@@ -229,7 +229,7 @@ void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 	hwmon = thermal_hwmon_lookup_by_type(tz);
 	if (unlikely(!hwmon)) {
 		/* Should never happen... */
-		dev_dbg(hwmon->device, "hwmon device lookup failed!\n");
+		dev_dbg(&tz->device, "hwmon device lookup failed!\n");
 		return;
 	}
 
-- 
2.25.1