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btrfs: Init io_lock after cloning btrfs device struct

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commit 1cba0cdf5e upstream.

__btrfs_close_devices() clones btrfs device structs with
memcpy(). Some of the fields in the clone are reinitialized, but it's
missing to init io_lock. In mainline this goes unnoticed, but on RT it
leaves the plist pointing to the original about to be freed lock
struct.

Initialize io_lock after cloning, so no references to the original
struct are left.

Reported-and-tested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2013-02-20 14:06:20 -05:00 committed by Greg Kroah-Hartman
parent a5646410c2
commit d0e44ede19
1 changed files with 1 additions and 0 deletions
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1
fs/btrfs/volumes.c
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@ -557,6 +557,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
new_device->writeable = 0;
new_device->in_fs_metadata = 0;
new_device->can_discard = 0;
spin_lock_init(&new_device->io_lock);
list_replace_rcu(&device->dev_list, &new_device->dev_list);
call_rcu(&device->rcu, free_device);