[jgardou] 53583: [WIN32K] - Avoid invalid memory write. See issue #5969 for more details.

Author: jgardou
Date: Sun Sep  4 15:58:48 2011
New Revision: 53583

URL: http://svn.reactos.org/svn/reactos?rev=53583&view=rev
Log:
[WIN32K]
- Avoid invalid memory write.
See issue #5969 for more details.

Modified:
    trunk/reactos/subsystems/win32/win32k/ntuser/misc.c

Modified: trunk/reactos/subsystems/win32/win32k/ntuser/misc.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/nt…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/ntuser/misc.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/ntuser/misc.c [iso-8859-1] Sun Sep  4 15:58:48
2011
@@ -497,11 +497,14 @@
     pti->pClientInfo = pci;
     _SEH2_TRY
     {
-        ProbeForWrite( Teb,
-                       sizeof(TEB),
-                       sizeof(ULONG));
-
-        Teb->Win32ThreadInfo = (PW32THREAD) pti;
+        if(Teb)
+        {    
+            ProbeForWrite( Teb,
+                           sizeof(TEB),
+                           sizeof(ULONG));
+
+            Teb->Win32ThreadInfo = (PW32THREAD) pti;
+        }
 
         pci->ppi = ppi;
         pci->fsHooks = pti->fsHooks;