commit 1357272fc7deeebb7b3c5d1a071562edc273cdaf
author Ilya Dryomov <idryomov@gmail.com> Wed Oct 02 20:41:01 2013 +0300
committer Josef Bacik <jbacik@fusionio.com> Fri Oct 04 16:02:14 2013 -0400
tree 37af6be54b03e07b4fb06a2ddc4c5ac739c53032
parent 964fb15acfcd672ac691f04879b71f07ccc21e0c

Btrfs: fix a use-after-free bug in btrfs_dev_replace_finishing

free_device rcu callback, scheduled from btrfs_rm_dev_replace_srcdev,
can be processed before btrfs_scratch_superblock is called, which would
result in a use-after-free on btrfs_device contents.  Fix this by
zeroing the superblock before the rcu callback is registered.

Cc: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>