[PATCH] Driver core: potentially fix use after free in class_device_attr_show
[linux-3.10.git] / drivers / base / class.c
index 479c12570881374f9bdb6fafb172879b583b20bc..0154a1623b2198965be09dbf4bd9552b5525ba4e 100644 (file)
@@ -299,6 +299,11 @@ static void class_dev_release(struct kobject * kobj)
 
        pr_debug("device class '%s': release.\n", cd->class_id);
 
+       if (cd->devt_attr) {
+               kfree(cd->devt_attr);
+               cd->devt_attr = NULL;
+       }
+
        if (cls->release)
                cls->release(cd);
        else {
@@ -591,11 +596,8 @@ void class_device_del(struct class_device *class_dev)
 
        if (class_dev->dev)
                sysfs_remove_link(&class_dev->kobj, "device");
-       if (class_dev->devt_attr) {
+       if (class_dev->devt_attr)
                class_device_remove_file(class_dev, class_dev->devt_attr);
-               kfree(class_dev->devt_attr);
-               class_dev->devt_attr = NULL;
-       }
        class_device_remove_attrs(class_dev);
 
        kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE);