[aandrejevic] 69408: [NTVDM] Fix a division-by-zero problem by storing the mouse driver's Width and Height in DWORDs, thus avoiding the integer overflow which could make them zero.

Author: aandrejevic
Date: Mon Sep 28 18:55:26 2015
New Revision: 69408

URL: http://svn.reactos.org/svn/reactos?rev=69408&view=rev
Log:
[NTVDM]
Fix a division-by-zero problem by storing the mouse driver's Width and Height
in DWORDs, thus avoiding the integer overflow which could make them zero.


Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/dos/mouse32.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/mouse32.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/mouse32.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/mouse32.c	[iso-8859-1] Mon Sep 28 18:55:26
2015
@@ -211,8 +211,8 @@
 static VOID ToMouseCoordinates(PCOORD Position)
 {
     COORD Resolution = VgaGetDisplayResolution();
-    WORD Width = DriverState.MaxX - DriverState.MinX + 1;
-    WORD Height = DriverState.MaxY - DriverState.MinY + 1;
+    DWORD Width = DriverState.MaxX - DriverState.MinX + 1;
+    DWORD Height = DriverState.MaxY - DriverState.MinY + 1;
 
     if (!VgaGetDoubleVisionState(NULL, NULL))
     {
@@ -227,8 +227,8 @@
 static VOID FromMouseCoordinates(PCOORD Position)
 {
     COORD Resolution = VgaGetDisplayResolution();
-    WORD Width = DriverState.MaxX - DriverState.MinX + 1;
-    WORD Height = DriverState.MaxY - DriverState.MinY + 1;
+    DWORD Width = DriverState.MaxX - DriverState.MinX + 1;
+    DWORD Height = DriverState.MaxY - DriverState.MinY + 1;
 
     if (!VgaGetDoubleVisionState(NULL, NULL))
     {