diff mbox series

[5.8,132/177] kobject: Restore old behaviour of kobject_del(NULL)

Message ID 20200915140659.978304138@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH Sept. 15, 2020, 2:13 p.m. UTC 
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

commit 40b8b826a6998639dd1c26f0e127f18371e1058d upstream.

The commit 079ad2fb4bf9 ("kobject: Avoid premature parent object freeing in
kobject_cleanup()") inadvertently dropped a possibility to call kobject_del()
with NULL pointer. Restore the old behaviour.

Fixes: 079ad2fb4bf9 ("kobject: Avoid premature parent object freeing in kobject_cleanup()")
Cc: stable <stable@vger.kernel.org>
Reported-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Link: https://lore.kernel.org/r/20200803082706.65347-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 lib/kobject.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -637,8 +637,12 @@  static void __kobject_del(struct kobject
  */
 void kobject_del(struct kobject *kobj)
 {
-	struct kobject *parent = kobj->parent;
+	struct kobject *parent;
 
+	if (!kobj)
+		return;
+
+	parent = kobj->parent;
 	__kobject_del(kobj);
 	kobject_put(parent);
 }