Revision 51090c5d6de08cfc86b2d861775dedddd9a2c023 authored by Linus Torvalds on 10 December 2017, 16:30:04 UTC, committed by Linus Torvalds on 10 December 2017, 16:30:04 UTC
Pull btrfs fixes from David Sterba: "This contains a few fixes (error handling, quota leak, FUA vs nobarrier mount option). There's one one worth mentioning separately - an off-by-one fix that leads to overwriting first byte of an adjacent page with 0, out of bounds of the memory allocated by an ioctl. This is under a privileged part of the ioctl, can be triggerd in some subvolume layouts" * tag 'for-4.15-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: btrfs: Fix possible off-by-one in btrfs_search_path_in_tree Btrfs: disable FUA if mounted with nobarrier btrfs: fix missing error return in btrfs_drop_snapshot btrfs: handle errors while updating refcounts in update_ref_for_cow btrfs: Fix quota reservation leak on preallocated files
nfs4getroot.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool auth_probe)
{
struct nfs_fsinfo fsinfo;
int ret = -ENOMEM;
fsinfo.fattr = nfs_alloc_fattr();
if (fsinfo.fattr == NULL)
goto out;
/* Start by getting the root filehandle from the server */
ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo, auth_probe);
if (ret < 0) {
dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
goto out;
}
if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
|| !S_ISDIR(fsinfo.fattr->mode)) {
printk(KERN_ERR "nfs4_get_rootfh:"
" getroot encountered non-directory\n");
ret = -ENOTDIR;
goto out;
}
memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
out:
nfs_free_fattr(fsinfo.fattr);
return ret;
}
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