From 767c244e7c023880b4eb555a07a42f5d8e4b364e Mon Sep 17 00:00:00 2001
From: Kevin Day <thekevinday@gmail.com>
Date: Sat, 24 Dec 2022 19:34:40 -0600
Subject: [PATCH] Security: Check if 'main' is NULL.

---
 level_3/control/c/control.c       | 2 ++
 level_3/control/c/control.h       | 1 +
 level_3/controller/c/controller.c | 2 ++
 level_3/controller/c/controller.h | 1 +
 4 files changed, 6 insertions(+)

diff --git a/level_3/control/c/control.c b/level_3/control/c/control.c
index 4958d1c..5b57bcd 100644
--- a/level_3/control/c/control.c
+++ b/level_3/control/c/control.c
@@ -10,6 +10,8 @@ extern "C" {
 #ifndef _di_control_print_help_
   f_status_t control_print_help(const fll_program_data_t * const main) {
 
+    if (!main) return F_output_not;
+
     flockfile(main->output.to.stream);
 
     fll_program_print_help_header(main->output.to, main->context, control_program_name_long_s, control_program_version_s);
diff --git a/level_3/control/c/control.h b/level_3/control/c/control.h
index c218b00..2d4f23a 100644
--- a/level_3/control/c/control.h
+++ b/level_3/control/c/control.h
@@ -65,6 +65,7 @@ extern "C" {
  *
  * @return
  *   F_none on success.
+ *   F_output_not on success, but no printing is performed.
  *
  * @see control_main()
  */
diff --git a/level_3/controller/c/controller.c b/level_3/controller/c/controller.c
index 500f7dd..a88cda6 100644
--- a/level_3/controller/c/controller.c
+++ b/level_3/controller/c/controller.c
@@ -15,6 +15,8 @@ extern "C" {
 #ifndef _di_controller_print_help_
   f_status_t controller_print_help(controller_main_t * const main) {
 
+    if (!main) return F_output_not;
+
     controller_lock_print(main->output.to, 0);
 
     fll_program_print_help_header(main->output.to, main->context, *main->program_name_long, controller_program_version_s);
diff --git a/level_3/controller/c/controller.h b/level_3/controller/c/controller.h
index e30842a..69c5971 100644
--- a/level_3/controller/c/controller.h
+++ b/level_3/controller/c/controller.h
@@ -91,6 +91,7 @@ extern "C" {
  *
  * @return
  *   F_none on success.
+ *   F_output_not on success, but no printing is performed.
  *
  * @see controller_main()
  */
-- 
1.8.3.1