kobject: sanitize argument for format string

Unlike kobject_set_name(), the kset_create_and_add() interface does not
provide a way to use format strings, so make sure that the interface
cannot be abused accidentally. It looks like all current callers use
static strings, so there's no existing flaw.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

lib/kobject.c

@@ -805,7 +805,7 @@ static struct kset *kset_create(const char *name,
 	kset = kzalloc(sizeof(*kset), GFP_KERNEL);
 	if (!kset)
 		return NULL;
-	retval = kobject_set_name(&kset->kobj, name);
+	retval = kobject_set_name(&kset->kobj, "%s", name);
 	if (retval) {
 		kfree(kset);
 		return NULL;