This is a note to let you know that I've just added the patch titled
kobject: Restore old behaviour of kobject_del(NULL)
to my driver-core git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
in the driver-core-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 40b8b826a6998639dd1c26f0e127f18371e1058d Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Date: Mon, 3 Aug 2020 11:27:06 +0300
Subject: kobject: Restore old behaviour of kobject_del(NULL)
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@xxxxxxxxxxxxxxx>
Reported-by: Qu Wenruo <quwenruo.btrfs@xxxxxxx>
Cc: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Link: https://lore.kernel.org/r/20200803082706.65347-1-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/kobject.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/lib/kobject.c b/lib/kobject.c
index 3afb939f2a1c..9dce68c378e6 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -637,8 +637,12 @@ static void __kobject_del(struct kobject *kobj)
*/
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);
}
--
2.28.0
