From c71862174a60e0719751afa9ca8f2ebcaa774f39 Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Wed, 7 Jan 2009 18:59:46 +0000
Subject: (svn r14905) -Fix (r14899): in some corner cases already freed memory
 could be read.

---
 src/viewport.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'src/viewport.cpp')

diff --git a/src/viewport.cpp b/src/viewport.cpp
index 64f4898a1..88278309b 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -219,8 +219,7 @@ static Point _vp_move_offs;
 
 static void DoSetViewportPosition(const Window *w, int left, int top, int width, int height)
 {
-
-	for (; w != NULL; w = w->z_front) {
+	FOR_ALL_WINDOWS_FROM_BACK_FROM(w, w) {
 		if (left + width > w->left &&
 				w->left + w->width > left &&
 				top + height > w->top &&
-- 
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