linux-kernel - [PATCH 4.14 015/178] ovl: Pass ovl_get

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Date:   Mon, 18 Dec 2017 16:47:31 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vivek Goyal <vgoyal@...hat.com>,
        Amir Goldstein <amir73il@...il.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 4.14 015/178] ovl: Pass ovl_get_nlink() parameters in right order

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vivek Goyal <vgoyal@...hat.com>

commit 08d8f8a5b094b66b29936e8751b4a818b8db1207 upstream.

Right now we seem to be passing index as "lowerdentry" and origin.dentry
as "upperdentry". IIUC, we should pass these parameters in reversed order
and this looks like a bug.

Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
Acked-by: Amir Goldstein <amir73il@...il.com>
Fixes: caf70cb2ba5d ("ovl: cleanup orphan index entries")
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/overlayfs/namei.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -437,7 +437,7 @@ int ovl_verify_index(struct dentry *inde
 
 	/* Check if index is orphan and don't warn before cleaning it */
 	if (d_inode(index)->i_nlink == 1 &&
-	    ovl_get_nlink(index, origin.dentry, 0) == 0)
+	    ovl_get_nlink(origin.dentry, index, 0) == 0)
 		err = -ENOENT;
 
 	dput(origin.dentry);