Index: main/tcptls.c
===================================================================
--- main/tcptls.c	(revision 310037)
+++ main/tcptls.c	(working copy)
@@ -139,8 +139,12 @@
 	* open a FILE * as appropriate.
 	*/
 	if (!tcptls_session->parent->tls_cfg) {
-		tcptls_session->f = fdopen(tcptls_session->fd, "w+");
-		setvbuf(tcptls_session->f, NULL, _IONBF, 0);
+		if ((tcptls_session->f = fdopen(tcptls_session->fd, "w+"))) {
+			if(setvbuf(tcptls_session->f, NULL, _IONBF, 0)) {
+				fclose(tcptls_session->f);
+				tcptls_session->f = NULL;
+			}
+		}
 	}
 #ifdef DO_SSL
 	else if ( (tcptls_session->ssl = SSL_new(tcptls_session->parent->tls_cfg->ssl_ctx)) ) {