Btrfs: fix double free in the iterate_extent_inodes()

If btrfs_find_all_roots() fails, 'roots' has been freed or 'roots'
fails to allocate. We don't need to free it outside btrfs_find_all_roots()
again.Fix it.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 3dd0693bad78..ba0fee7c3237 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1510,11 +1510,9 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
                                                 iterate, ctx);
                 }
                 ulist_free(roots);
-                roots = NULL;
         }
 
         free_leaf_list(refs);
-        ulist_free(roots);
 out:
         if (!search_commit_root) {
                 btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);