From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Thu, 12 Aug 2010 03:13:54 +0000 (+0100)
Subject: dm: prevent access to md being deleted
X-Git-Tag: v2.6.34.6~50
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=97159b7360b1e15419b417da17e7cd227a4195cc;p=thirdparty%2Fkernel%2Fstable.git

dm: prevent access to md being deleted

commit abdc568b0540bec6d3e0afebac496adef1189b77 upstream.

This patch prevents access to mapped_device which is being deleted.

Currently, even after a mapped_device has been removed from the hash,
it could be accessed through idr_find() using minor number.
That could cause a race and NULL pointer reference below:
  CPU0                          CPU1
  ------------------------------------------------------------------
  dev_remove(param)
    down_write(_hash_lock)
    dm_lock_for_deletion(md)
      spin_lock(_minor_lock)
      set_bit(DMF_DELETING)
      spin_unlock(_minor_lock)
    __hash_remove(hc)
    up_write(_hash_lock)
                                dev_status(param)
                                  md = find_device(param)
                                         down_read(_hash_lock)
                                         __find_device_hash_cell(param)
                                           dm_get_md(param->dev)
                                             md = dm_find_md(dev)
                                                    spin_lock(_minor_lock)
                                                    md = idr_find(MINOR(dev))
                                                    spin_unlock(_minor_lock)
    dm_put(md)
      free_dev(md)
                                             dm_get(md)
                                         up_read(_hash_lock)
                                  __dev_status(md, param)
                                  dm_put(md)

This patch fixes such problems.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index d21e1284604f6..56d192dbe9f11 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2141,6 +2141,7 @@ static struct mapped_device *dm_find_md(dev_t dev)
 	md = idr_find(&_minor_idr, minor);
 	if (md && (md == MINOR_ALLOCED ||
 		   (MINOR(disk_devt(dm_disk(md))) != minor) ||
+		   dm_deleting_md(md) ||
 		   test_bit(DMF_FREEING, &md->flags))) {
 		md = NULL;
 		goto out;