linux-kernel - [PATCH 2/2] livepatch: Use correct kobject cleanup function

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Date:   Tue, 30 Apr 2019 10:15:34 +1000
From:   "Tobin C. Harding" <tobin@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>
Cc:     "Tobin C. Harding" <tobin@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] livepatch: Use correct kobject cleanup function

The correct cleanup function after a call to kobject_init_and_add() has
succeeded is kobject_del() _not_ kobject_put().  kobject_del() calls
kobject_put().

Use correct cleanup function when removing a kobject.

Signed-off-by: Tobin C. Harding <tobin@...nel.org>
---
 kernel/livepatch/core.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 98a7bec41faa..4cce6bb6e073 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -589,9 +589,8 @@ static void __klp_free_funcs(struct klp_object *obj, bool nops_only)
 
 		list_del(&func->node);
 
-		/* Might be called from klp_init_patch() error path. */
 		if (func->kobj_added) {
-			kobject_put(&func->kobj);
+			kobject_del(&func->kobj);
 		} else if (func->nop) {
 			klp_free_func_nop(func);
 		}
@@ -625,9 +624,8 @@ static void __klp_free_objects(struct klp_patch *patch, bool nops_only)
 
 		list_del(&obj->node);
 
-		/* Might be called from klp_init_patch() error path. */
 		if (obj->kobj_added) {
-			kobject_put(&obj->kobj);
+			kobject_del(&obj->kobj);
 		} else if (obj->dynamic) {
 			klp_free_object_dynamic(obj);
 		}
@@ -676,7 +674,7 @@ static void klp_free_patch_finish(struct klp_patch *patch)
 	 * cannot get enabled again.
 	 */
 	if (patch->kobj_added) {
-		kobject_put(&patch->kobj);
+		kobject_del(&patch->kobj);
 		wait_for_completion(&patch->finish);
 	}
 
-- 
2.21.0