From 3fead8fa3b4fa8451525afaef32fd59e97fecc2b Mon Sep 17 00:00:00 2001
From: Jukka Heinonen <jhei@iki.fi>
Date: Fri, 15 Feb 2002 18:22:23 +0000
Subject: [PATCH] Convert some invalid offsets in GetWindowLong16 into valid
 offsets.

---
 windows/win.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/windows/win.c b/windows/win.c
index a1d3135d9c7..4572666b8da 100644
--- a/windows/win.c
+++ b/windows/win.c
@@ -1873,6 +1873,24 @@ static LONG WIN_GetWindowLong( HWND hwnd, INT offset, WINDOWPROCTYPE type )
     {
         if (offset > wndPtr->cbWndExtra - sizeof(LONG))
         {
+          /*
+            * Some programs try to access last element from 16 bit
+            * code using illegal offset value. Hopefully this is
+            * what those programs really expect.
+            */
+           if (type == WIN_PROC_16 && 
+               wndPtr->cbWndExtra >= 4 &&
+               offset == wndPtr->cbWndExtra - sizeof(WORD))
+           {
+               INT offset2 = wndPtr->cbWndExtra - sizeof(LONG);
+             
+               ERR( "- replaced invalid offset %d with %d\n",
+                    offset, offset2 );
+           
+                retvalue = *(LONG *)(((char *)wndPtr->wExtra) + offset2);
+                WIN_ReleasePtr( wndPtr );
+                return retvalue;
+            }
             WARN("Invalid offset %d\n", offset );
             WIN_ReleasePtr( wndPtr );
             SetLastError( ERROR_INVALID_INDEX );