From: Holger Schemel <info@artsoft.org>
Date: Tue, 8 Feb 2022 15:17:42 +0000 (+0100)
Subject: fixed crash bug caused by accessing invalid (off-playfield) array positions
X-Git-Tag: 4.3.1.1~3
X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=commitdiff_plain;h=b71e46505e5e3dc2213e67124dd1d245ca7a2cbb

fixed crash bug caused by accessing invalid (off-playfield) array positions

This bug caused accessing array "GfxElementEmpty[][]" out of bounds if
level position is not inside the playfield.
---

diff --git a/src/tools.c b/src/tools.c
index 0872e24b..6a998afb 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -1996,11 +1996,11 @@ void DrawScreenElementExt(int x, int y, int dx, int dy, int element,
   int graphic;
   int frame;
 
-  if (element == EL_EMPTY)
-    element = GfxElementEmpty[lx][ly];
-
   if (IN_LEV_FIELD(lx, ly))
   {
+    if (element == EL_EMPTY)
+      element = GfxElementEmpty[lx][ly];
+
     SetRandomAnimationValue(lx, ly);
 
     graphic = el_act_dir2img(element, GfxAction[lx][ly], GfxDir[lx][ly]);