linux-kernel - [PATCH v6 14/27] nfs_clone_sb_security(): simplify the check for server bogosity

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Message-Id: <20191210123115.1655-15-smayhew@redhat.com>
Date:   Tue, 10 Dec 2019 07:31:02 -0500
From:   Scott Mayhew <smayhew@...hat.com>
To:     anna.schumaker@...app.com, trond.myklebust@...merspace.com
Cc:     dhowells@...hat.com, viro@...iv.linux.org.uk,
        linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: [PATCH v6 14/27] nfs_clone_sb_security(): simplify the check for server bogosity

From: Al Viro <viro@...iv.linux.org.uk>

We used to check ->i_op for being nfs_dir_inode_operations.  With
separate inode_operations for v3 and v4 that became bogus, but
rather than going for protocol-dependent comparison we could've
just checked ->i_fop instead; _that_ is the same for all protocol
versions.

Reviewed-by: David Howells <dhowells@...hat.com>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/nfs/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2bcf0f8295e0..bec6c341f72c 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2578,7 +2578,7 @@ int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
 	unsigned long kflags = 0, kflags_out = 0;
 
 	/* clone any lsm security options from the parent to the new sb */
-	if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
+	if (d_inode(mntroot)->i_fop != &nfs_dir_operations)
 		return -ESTALE;
 
 	if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
-- 
2.17.2