Make free_strings() NULL safe

ok jsing

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libcrypto/ui/ui_lib.c b/src/lib/libcrypto/ui/ui_lib.c
index 06b29b8cee..27c7e5126f 100644
--- a/src/lib/libcrypto/ui/ui_lib.c
+++ b/src/lib/libcrypto/ui/ui_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ui_lib.c,v 1.34 2018/06/02 04:45:21 tb Exp $ */
+/* $OpenBSD: ui_lib.c,v 1.35 2020/09/24 19:22:18 tb Exp $ */
 /* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
  * project 2001.
  */
@@ -99,6 +99,8 @@ UI_new_method(const UI_METHOD *method)
 static void
 free_string(UI_STRING *uis)
 {
+        if (uis == NULL)
+                return;
         if (uis->flags & OUT_STRING_FREEABLE) {
                 free((char *) uis->out_string);
                 switch (uis->type) {