FAILED: patch "[PATCH] ext4: fix inode leak in ext4_xattr_inode_create() on an error" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-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]>.

Possible dependencies:

e4db04f7d3db ("ext4: fix inode leak in ext4_xattr_inode_create() on an error path") bd3b963b273e ("ext4: attach jinode after creation of xattr inode") e50e5129f384 ("ext4: xattr-in-inode support")
b8cb5a545c3d ("ext4: fix quota charging for shared xattr blocks") c755e251357a ("ext4: fix deadlock between inline_data and ext4_expand_extra_isize_ea()") d7614cc16146 ("ext4: correctly detect when an xattr value has an invalid size") 2f8f5e76c7da ("ext4: avoid lockdep warning when inheriting encryption context")

thanks,

greg k-h

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

From e4db04f7d3dbbe16680e0ded27ea2a65b10f766a Mon Sep 17 00:00:00 2001
From: Ye Bin <[email protected]>
Date: Thu, 8 Dec 2022 10:32:33 +0800
Subject: [PATCH] ext4: fix inode leak in ext4_xattr_inode_create() on an error
path

There is issue as follows when do setxattr with inject fault:

[localhost]# fsck.ext4 -fn /dev/sda
e2fsck 1.46.6-rc1 (12-Sep-2022)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Unattached zero-length inode 15. Clear? no

Unattached inode 15
Connect to /lost+found? no

Pass 5: Checking group summary information

/dev/sda: ********** WARNING: Filesystem still has errors **********

/dev/sda: 15/655360 files (0.0% non-contiguous), 66755/2621440 blocks

This occurs in 'ext4_xattr_inode_create()'. If 'ext4_mark_inode_dirty()' fails, dropping i_nlink of the inode is needed. Or will lead to inode leak.

index b666d3bf8b38..7decaaf27e82 100644
@@ -1441,6 +1441,9 @@ static struct inode *ext4_xattr_inode_create(handle_t *handle,
 		if (!err)
 			err = ext4_inode_attach_jinode(ea_inode);
 		if (err) {
+			if (ext4_xattr_inode_dec_ref(handle, ea_inode))
+				ext4_warning_inode(ea_inode,
+					"cleanup dec ref error %d", err);
 			iput(ea_inode);
 			return ERR_PTR(err);
 		}