diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 0c7addcd1985..a4793cfb68f2 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -861,6 +861,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
 		blkg = blkg_lookup_check(pos, pol, q);
 		if (IS_ERR(blkg)) {
 			ret = PTR_ERR(blkg);
+			blkg_free(new_blkg);
 			goto fail_unlock;
 		}