ACPI / EC: Fix a memory leakage issue in acpi_ec_add()

When the handler installation failed, there was no code to free the
allocated EC device. This patch fixes this memory leakage issue.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=115021
Reported-and-tested-by: Luya Tshimbalanga <luya@fedoraproject.org>
Tested-by: Jonh Henderson <jw.hendy@gmail.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/ec.c

@@ -1513,14 +1513,18 @@ static int acpi_ec_add(struct acpi_device *device)
 		return -ENOMEM;
 	if (ec_parse_device(device->handle, 0, ec, NULL) !=
 		AE_CTRL_TERMINATE) {
-			acpi_ec_free(ec);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto err_alloc;
 	}
 
 	/* Find and register all query methods */
 	acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
 			    acpi_ec_register_query_methods, NULL, ec, NULL);
 
+	ret = acpi_config_boot_ec(ec, false);
+	if (ret)
+		goto err_query;
+
 	device->driver_data = ec;
 
 	ret = !!request_region(ec->data_addr, 1, "EC data");
@@ -1528,13 +1532,17 @@ static int acpi_ec_add(struct acpi_device *device)
 	ret = !!request_region(ec->command_addr, 1, "EC cmd");
 	WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
 
-	ret = acpi_config_boot_ec(ec, false);
-
 	/* Reprobe devices depending on the EC */
 	acpi_walk_dep_device_list(ec->handle);
 
 	/* EC is fully operational, allow queries */
 	acpi_ec_enable_event(ec);
+	return 0;
+
+err_query:
+	acpi_ec_remove_query_handlers(ec, true, 0);
+err_alloc:
+	acpi_ec_free(ec);
 	return ret;
 }