diff -up sudo-1.8.6p3/src/sudo.c.orig sudo-1.8.6p3/src/sudo.c
--- sudo-1.8.6p3/src/sudo.c.orig	2015-11-23 18:19:45.051010282 +1000
+++ sudo-1.8.6p3/src/sudo.c	2015-11-23 18:19:57.795997701 +1000
@@ -482,6 +482,9 @@ get_user_info(struct user_details *ud)
 	    errorx(1, _("unable to allocate memory"));
 	ud->cwd = user_info[i] + sizeof("cwd=") - 1;
     }
+    else {
+	errorx(1, _("unable to resolve current working directory"));
+    }
 
     if ((cp = get_process_ttyname()) != NULL) {
 	user_info[++i] = fmt_string("tty", cp);