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Commit dee972b9 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Fix error reporting in nfs_xdev_mount 



Currently, nfs_xdev_mount converts all errors from clone_server() to
ENOMEM, which can then leak to userspace (for instance to 'mount'). Fix that.
Also ensure that if nfs_fs_mount_common() returns an error, we
don't dprintk(0)...

The regression originated in commit 3d176e3f
(NFS: Use nfs_fs_mount_common() for xdev mounts)

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org [>= 3.5]
parent 949db153

fs/nfs/super.c

+9 −13
Original line number Diff line number Diff line
@@ -2589,27 +2589,23 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags, 
	struct nfs_server *server;

	struct dentry *mntroot = ERR_PTR(-ENOMEM);

	struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;

	int error;



	dprintk("--> nfs_xdev_mount_common()\n");

	dprintk("--> nfs_xdev_mount()\n");



	mount_info.mntfh = mount_info.cloned->fh;



	/* create a new volume representation */

	server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);

	if (IS_ERR(server)) {

		error = PTR_ERR(server);

		goto out_err;

	}



	mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);

	dprintk("<-- nfs_xdev_mount_common() = 0\n");

out:

	return mntroot;

	if (IS_ERR(server))

		mntroot = ERR_CAST(server);

	else

		mntroot = nfs_fs_mount_common(server, flags,

				dev_name, &mount_info, nfs_mod);



out_err:

	dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);

	goto out;

	dprintk("<-- nfs_xdev_mount() = %ld\n",

			IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);

	return mntroot;

}



#if IS_ENABLED(CONFIG_NFS_V4)