/*
 *   fs/cifs/export.c
 *
 *   Copyright (C) International Business Machines  Corp., 2007
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   Common Internet FileSystem (CIFS) client
 *
 *   Operations related to support for exporting files via NFSD
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

 /*
  * See Documentation/filesystems/nfs/Exporting
  * and examples in fs/exportfs
  *
  * Since cifs is a network file system, an "fsid" must be included for
  * any nfs exports file entries which refer to cifs paths.  In addition
  * the cifs mount must be mounted with the "serverino" option (ie use stable
  * server inode numbers instead of locally generated temporary ones).
  * Although cifs inodes do not use generation numbers (have generation number
  * of zero) - the inode number alone should be good enough for simple cases
  * in which users want to export cifs shares with NFS. The decode and encode
  * could be improved by using a new routine which expects 64 bit inode numbers
  * instead of the default 32 bit routines in fs/exportfs
  *
  */

#include <linux/fs.h>
#include <linux/exportfs.h>
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifsfs.h"

#ifdef CONFIG_CIFS_NFSD_EXPORT
static struct dentry *cifs_get_parent(struct dentry *dentry)
{
	/* BB need to add code here eventually to enable export via NFSD */
	cifs_dbg(FYI, "get parent for %p\n", dentry);
	return ERR_PTR(-EACCES);
}

const struct export_operations cifs_export_ops = {
	.get_parent = cifs_get_parent,
/*	Following five export operations are unneeded so far and can default:
	.get_dentry =
	.get_name =
	.find_exported_dentry =
	.decode_fh =
	.encode_fs =  */
};

#endif /* CONFIG_CIFS_NFSD_EXPORT */

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<tr><th>author</th><td>Andrey Ryabinin &lt;aryabinin@virtuozzo.com&gt;</td><td class='right'>2017-01-26 17:32:11 +0300</td></tr>
<tr><th>committer</th><td>Jani Nikula &lt;jani.nikula@intel.com&gt;</td><td class='right'>2017-02-08 13:09:24 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=5351fbb1bf1413f6024892093528280769ca852f'>5351fbb1bf1413f6024892093528280769ca852f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=5351fbb1bf1413f6024892093528280769ca852f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=5351fbb1bf1413f6024892093528280769ca852f'>ec270f90f25882708a53ee88a0513ca6198c1d9d</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c'>d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=5351fbb1bf1413f6024892093528280769ca852f&amp;id2=d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c'>diff</a>)</td></tr></table>
<div class='commit-subject'>drm/i915: fix use-after-free in page_flip_completed()</div><div class='commit-msg'>page_flip_completed() dereferences 'work' variable after executing
queue_work(). This is not safe as the 'work' item might be already freed
by queued work:

    BUG: KASAN: use-after-free in page_flip_completed+0x3ff/0x490 at addr ffff8803dc010f90
    Call Trace:
     __asan_report_load8_noabort+0x59/0x80
     page_flip_completed+0x3ff/0x490
     intel_finish_page_flip_mmio+0xe3/0x130
     intel_pipe_handle_vblank+0x2d/0x40
     gen8_irq_handler+0x4a7/0xed0
     __handle_irq_event_percpu+0xf6/0x860
     handle_irq_event_percpu+0x6b/0x160
     handle_irq_event+0xc7/0x1b0
     handle_edge_irq+0x1f4/0xa50
     handle_irq+0x41/0x70
     do_IRQ+0x9a/0x200
     common_interrupt+0x89/0x89

    Freed:
     kfree+0x113/0x4d0
     intel_unpin_work_fn+0x29a/0x3b0
     process_one_work+0x79e/0x1b70
     worker_thread+0x611/0x1460
     kthread+0x241/0x3a0
     ret_from_fork+0x27/0x40

Move queue_work() after	trace_i915_flip_complete() to fix this.

Fixes: e5510fac98a7 ("drm/i915: add tracepoints for flip requests &amp; completions")
Signed-off-by: Andrey Ryabinin &lt;aryabinin@virtuozzo.com&gt;
Cc: &lt;stable@vger.kernel.org&gt; # v2.6.36+
Reviewed-by: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Signed-off-by: Daniel Vetter &lt;daniel.vetter@ffwll.ch&gt;
Link: http://patchwork.freedesktop.org/patch/msgid/20170126143211.24013-1-aryabinin@virtuozzo.com
(cherry picked from commit 05c41f926fcc7ef838c80a6a99d84f67b4e0b824)
Signed-off-by: Jani Nikula &lt;jani.nikula@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=5351fbb1bf1413f6024892093528280769ca852f'>Diffstat</a></div><table summary='diffstat' class='diffstat'>