diff -up openssh-8.4p1/ssh-agent.c.cve-2021-28041 openssh-8.4p1/ssh-agent.c
--- openssh-8.4p1/ssh-agent.c.cve-2021-28041	2021-06-17 13:15:58.691479334 +0200
+++ openssh-8.4p1/ssh-agent.c	2021-06-17 13:17:16.573118348 +0200
@@ -581,6 +581,7 @@ process_add_identity(SocketEntry *e)
 				goto err;
 			}
 			free(ext_name);
+			ext_name = NULL;
 			break;
 		default:
 			error("%s: Unknown constraint %d", __func__, ctype);