avoid a potential double free

ok gilles@

diff --git a/usr.sbin/smtpd/mda.c b/usr.sbin/smtpd/mda.c
index 0ea145f..e298938 100644 (file)
--- a/usr.sbin/smtpd/mda.c
+++ b/usr.sbin/smtpd/mda.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: mda.c,v 1.110 2015/10/11 12:09:06 sunil Exp $ */
+/*     $OpenBSD: mda.c,v 1.111 2015/10/26 09:22:03 jsg Exp $   */
 
 /*
  * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
@@ -511,6 +511,7 @@ mda_io(struct io *io, int evt)
                }
 
                free(ln);
+               ln = NULL;
                if (ferror(s->datafp)) {
                        log_debug("debug: mda: ferror on session %016"PRIx64,
                            s->id);