Btrfs: don't delete fs_roots until after we cleanup the transaction

We get a use after free if we had a transaction to cleanup since there could be
delayed inodes which refer to their respective fs_root.  Thanks

Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e7b3cb5286a5..bdaa092d6296 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2859,8 +2859,8 @@ fail_qgroup:
         btrfs_free_qgroup_config(fs_info);
 fail_trans_kthread:
         kthread_stop(fs_info->transaction_kthread);
-        del_fs_roots(fs_info);
         btrfs_cleanup_transaction(fs_info->tree_root);
+        del_fs_roots(fs_info);
 fail_cleaner:
         kthread_stop(fs_info->cleaner_kthread);