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Convert some invalid offsets in GetWindowLong16 into valid offsets.

This commit is contained in:
Jukka Heinonen 2002-02-15 18:22:23 +00:00 committed by Alexandre Julliard
parent 0f9013f7e0
commit 3fead8fa3b
1 changed files with 18 additions and 0 deletions
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18
windows/win.c
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@ -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 );