thermal/core: Fix null pointer dereference in thermal_release()

If both dev_set_name() and device_register() failed, then null pointer
dereference occurs in thermal_release() which will use strncmp() to
compare the name.

So fix it by adding dev_set_name() return value check.

Signed-off-by: Yuanzheng Song <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daniel Lezcano <[email protected]>

Author: Yuanzheng Song

drivers/thermal/thermal_core.c

@@ -904,6 +904,10 @@ __thermal_cooling_device_register(struct device_node *np,
 		goto out_kfree_cdev;
 	cdev->id = ret;
 
+	ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
+	if (ret)
+		goto out_ida_remove;
+
 	cdev->type = kstrdup(type ? type : "", GFP_KERNEL);
 	if (!cdev->type) {
 		ret = -ENOMEM;
@@ -918,7 +922,6 @@ __thermal_cooling_device_register(struct device_node *np,
 	cdev->device.class = &thermal_class;
 	cdev->devdata = devdata;
 	thermal_cooling_device_setup_sysfs(cdev);
-	dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 	ret = device_register(&cdev->device);
 	if (ret)
 		goto out_kfree_type;
@@ -1229,6 +1232,10 @@ thermal_zone_device_register(const char *type, int trips, int mask,
 	tz->id = id;
 	strlcpy(tz->type, type, sizeof(tz->type));
 
+	result = dev_set_name(&tz->device, "thermal_zone%d", tz->id);
+	if (result)
+		goto remove_id;
+
 	if (!ops->critical)
 		ops->critical = thermal_zone_device_critical;
 
@@ -1250,7 +1257,6 @@ thermal_zone_device_register(const char *type, int trips, int mask,
 	/* A new thermal zone needs to be updated anyway. */
 	atomic_set(&tz->need_update, 1);
 
-	dev_set_name(&tz->device, "thermal_zone%d", tz->id);
 	result = device_register(&tz->device);
 	if (result)
 		goto release_device;