[PATCH 2/3] thermal: of: Fix OF node leak in thermal_of_zone_register()

[Krzysztof Kozlowski]

thermal_of_zone_register() calls of_thermal_zone_find() which will
iterate over OF nodes with for_each_available_child_of_node() to find
matching thermal zone node.  When it finds such, it exits the loop and
returns the node.  Prematurely ending for_each_available_child_of_node()
loops requires dropping OF node reference, thus success of
of_thermal_zone_find() means that caller must drop the reference.

Fixes: 3fd6d6e2b4e8 ("thermal/of: Rework the thermal device tree initialization")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
 drivers/thermal/thermal_of.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 30f8d6e70484..b08a9b64718d 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -491,7 +491,8 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
 	trips = thermal_of_trips_init(np, &ntrips);
 	if (IS_ERR(trips)) {
 		pr_err("Failed to find trip points for %pOFn id=%d\n", sensor, id);
-		return ERR_CAST(trips);
+		ret = PTR_ERR(trips);
+		goto out_of_node_put;
 	}
 
 	ret = thermal_of_monitor_init(np, &delay, &pdelay);
@@ -519,6 +520,7 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
 		goto out_kfree_trips;
 	}
 
+	of_node_put(np);
 	kfree(trips);
 
 	ret = thermal_zone_device_enable(tz);
@@ -533,6 +535,8 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
 
 out_kfree_trips:
 	kfree(trips);
+out_of_node_put:
+	of_node_put(np);
 
 	return ERR_PTR(ret);
 }
-- 
2.43.0