4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Chengguang Xu <[email protected]> [ Upstream commit 18106734b512664a8541026519ce4b862498b6c3 ] When failing from ceph_fs_debugfs_init() in ceph_real_mount(), there is lack of dput of root_dentry and it causes slab errors, so change the calling order of ceph_fs_debugfs_init() and open_root_dentry() and do some cleanups to avoid this issue. Signed-off-by: Chengguang Xu <[email protected]> Reviewed-by: "Yan, Zheng" <[email protected]> Signed-off-by: Ilya Dryomov <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/ceph/super.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -837,7 +837,6 @@ static struct dentry *ceph_real_mount(st int err; unsigned long started = jiffies; /* note the start time */ struct dentry *root; - int first = 0; /* first vfsmount for this super_block */ dout("mount start %p\n", fsc); mutex_lock(&fsc->client->mount_mutex); @@ -862,17 +861,17 @@ static struct dentry *ceph_real_mount(st path = fsc->mount_options->server_path + 1; dout("mount opening path %s\n", path); } + + err = ceph_fs_debugfs_init(fsc); + if (err < 0) + goto out; + root = open_root_dentry(fsc, path, started); if (IS_ERR(root)) { err = PTR_ERR(root); goto out; } fsc->sb->s_root = dget(root); - first = 1; - - err = ceph_fs_debugfs_init(fsc); - if (err < 0) - goto fail; } else { root = dget(fsc->sb->s_root); } @@ -882,11 +881,6 @@ static struct dentry *ceph_real_mount(st mutex_unlock(&fsc->client->mount_mutex); return root; -fail: - if (first) { - dput(fsc->sb->s_root); - fsc->sb->s_root = NULL; - } out: mutex_unlock(&fsc->client->mount_mutex); return ERR_PTR(err);
