[tkreuzer] 63442: [WIN32K] Make sure to check for invalid NULL handles before passing them to GDIOBJ_bLockMultipleObjects, which skips NULL handles. This is a design limitation, since otherwise we ...

Author: tkreuzer
Date: Sun May 25 12:59:17 2014
New Revision: 63442

URL: http://svn.reactos.org/svn/reactos?rev=63442&view=rev
Log:
[WIN32K]
Make sure to check for invalid NULL handles before passing them to
GDIOBJ_bLockMultipleObjects, which skips NULL handles. This is a design limitation, since
otherwise we either need to pass a bitfield of valid handles, or duplicate  code in
certain functions, where different combinations of dest, source and mask dc are allowed.

Modified:
    trunk/reactos/win32ss/gdi/ntgdi/bitblt.c

Modified: trunk/reactos/win32ss/gdi/ntgdi/bitblt.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/win32ss/gdi/ntgdi/bitblt.c…
==============================================================================
--- trunk/reactos/win32ss/gdi/ntgdi/bitblt.c	[iso-8859-1] (original)
+++ trunk/reactos/win32ss/gdi/ntgdi/bitblt.c	[iso-8859-1] Sun May 25 12:59:17 2014
@@ -47,6 +47,12 @@
         return FALSE;
     }
 
+    if ((hDCDest == NULL) || (hDCSrc == NULL))
+    {
+        EngSetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+
     TRACE("Locking DCs\n");
     ahDC[0] = hDCDest;
     ahDC[1] = hDCSrc ;
@@ -161,14 +167,14 @@
        return NtGdiStretchBlt(hDCDest,
                               XDest,
                               YDest,
-                              Width,  
+                              Width,
                               Height,
                               hDCSrc,
                               XSrc,
                               YSrc,
                               Width,
                               Height,
-                              ROP, 
+                              ROP,
                               crBackColor);
 
     dwTRop = ROP & ~(NOMIRRORBITMAP|CAPTUREBLT);
@@ -212,6 +218,12 @@
     ULONG TransparentColor = 0;
     BOOL Ret = FALSE;
     EXLATEOBJ exlo;
+
+    if ((hdcDst == NULL) || (hdcSrc == NULL))
+    {
+        EngSetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
 
     TRACE("Locking DCs\n");
     ahDC[0] = hdcDst;