Merge "ext4: fix use-after-free in dx_release()"

{

	struct dx_root_info *info;

	int i;

	unsigned int indirect_levels;

	if (frames[0].bh == NULL)

		return;

	info = &((struct dx_root *)frames[0].bh->b_data)->info;

	for (i = 0; i <= info->indirect_levels; i++) {

	/* save local copy, "info" may be freed after brelse() */

	indirect_levels = info->indirect_levels;

	for (i = 0; i <= indirect_levels; i++) {

		if (frames[i].bh == NULL)

			break;

		brelse(frames[i].bh);