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>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 9eab651..50895ff 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/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;
 }