--- zzzz-none-000/linux-3.10.107/fs/quota/quota_tree.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/quota/quota_tree.c	2021-02-04 17:41:59.000000000 +0000
@@ -349,6 +349,13 @@
 				 struct dquot *dquot)
 {
 	int tmp = QT_TREEOFF;
+
+#ifdef __QUOTA_QT_PARANOIA
+	if (info->dqi_blocks <= QT_TREEOFF) {
+		quota_error(dquot->dq_sb, "Quota tree root isn't allocated!");
+		return -EIO;
+	}
+#endif
 	return do_insert_tree(info, dquot, &tmp, 0);
 }