FAILED: patch "[PATCH] ext4: fix leaking sysfs kobject after failed mount" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From cb8d53d2c97369029cc638c9274ac7be0a316c75 Mon Sep 17 00:00:00 2001
From: Eric Biggers <[email protected]>
Date: Tue, 22 Sep 2020 09:24:56 -0700
Subject: [PATCH] ext4: fix leaking sysfs kobject after failed mount

ext4_unregister_sysfs() only deletes the kobject. The reference to it needs to be put separately, like ext4_put_super() does.

This addresses the syzbot report
"memory leak in kobject_set_name_vargs (3)"
(https://syzkaller.appspot.com/bug?extid=9f864abad79fae7c17e1).

index ea425b49b345..41953b86ffe3 100644
@@ -4872,6 +4872,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 
 failed_mount8:
 	ext4_unregister_sysfs(sb);
+	kobject_put(&sbi->s_kobj);
 failed_mount7:
 	ext4_unregister_li_request(sb);
 failed_mount6: