From bf493d8b58c133521e49f7bb3b7ecb23ff15b3f2 Mon Sep 17 00:00:00 2001
From: Gleb Mazovetskiy <glex.spb@gmail.com>
Date: Thu, 10 Oct 2019 07:08:15 +0100
Subject: [PATCH] Fix UB: pointer overflow gmenu.cpp:112

---
 Source/gmenu.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/gmenu.cpp b/Source/gmenu.cpp
index 7422c1a31..b64638fce 100644
--- a/Source/gmenu.cpp
+++ b/Source/gmenu.cpp
@@ -109,7 +109,7 @@ void gmenu_call_proc(TMenuItem *pItem, void (*gmFunc)(TMenuItem *))
 			sgCurrentMenuIdx++;
 		}
 	}
-	sgpCurrItem = &sgpCurrentMenu[sgCurrentMenuIdx - 1];
+	sgpCurrItem = sgCurrentMenuIdx > 0 ? &sgpCurrentMenu[sgCurrentMenuIdx - 1] : nullptr;
 	gmenu_up_down(TRUE);
 }
 
@@ -386,7 +386,7 @@ void gmenu_slider_set(TMenuItem *pItem, int min, int max, int value)
 }
 
 /**
- * @brief Get the current value for the slider 
+ * @brief Get the current value for the slider
  */
 int gmenu_slider_get(TMenuItem *pItem, int min, int max)
 {