From: Jeff Layton <jlayton@kernel.org>
Date: Wed, 17 Apr 2019 12:58:28 -0400
Subject: ceph: ensure d_name stability in ceph_dentry_hash()
Git-commit: 76a495d666e5043ffc315695f8241f5e94a98849
Patch-mainline: v5.1-rc7
References: bsc#1134461

Take the d_lock here to ensure that d_name doesn't change.

Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/dir.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1466,6 +1466,7 @@ void ceph_dentry_lru_del(struct dentry *
 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
 {
 	struct ceph_inode_info *dci = ceph_inode(dir);
+	unsigned hash;
 
 	switch (dci->i_dir_layout.dl_dir_hash) {
 	case 0:	/* for backward compat */
@@ -1473,8 +1474,11 @@ unsigned ceph_dentry_hash(struct inode *
 		return dn->d_name.hash;
 
 	default:
-		return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
+		spin_lock(&dn->d_lock);
+		hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
 				     dn->d_name.name, dn->d_name.len);
+		spin_unlock(&dn->d_lock);
+		return hash;
 	}
 }