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kobject: Restore old behaviour of kobject_del(NULL)

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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>
This commit is contained in:
Andy Shevchenko 2020-08-03 11:27:06 +03:00 • committed by Greg Kroah-Hartman
commit b9fb631f6b
1 changed files with 5 additions and 1 deletions
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6
lib/kobject.c
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@ -630,8 +630,12 @@ 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);
}