Revision 1357272fc7deeebb7b3c5d1a071562edc273cdaf authored by Ilya Dryomov on 02 October 2013, 17:41:01 UTC, committed by Josef Bacik on 04 October 2013, 20:02:14 UTC
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>
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