[tfaber] 75020: [WIN32K:NTUSER] - Avoid crash on invalid format in UserEnumClipboardFormats. This is covered by user32_winetest but we currently fail that call before it can crash. The next commit ...

Author: tfaber
Date: Tue Jun 13 13:12:55 2017
New Revision: 75020

URL: http://svn.reactos.org/svn/reactos?rev=75020&view=rev
Log:
[WIN32K:NTUSER]
- Avoid crash on invalid format in UserEnumClipboardFormats. This is covered by user32_winetest but we currently fail that call before it can crash. The next commit will change that.
CORE-13414

Modified:
    trunk/reactos/win32ss/user/ntuser/clipboard.c

Modified: trunk/reactos/win32ss/user/ntuser/clipboard.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/win32ss/user/ntuser/clipboa...
==============================================================================
--- trunk/reactos/win32ss/user/ntuser/clipboard.c	[iso-8859-1] (original)
+++ trunk/reactos/win32ss/user/ntuser/clipboard.c	[iso-8859-1] Tue Jun 13 13:12:55 2017
@@ -448,9 +448,14 @@
     {
         /* Return next format */
         pElement = IntGetFormatElement(pWinStaObj, fmt);
-        ++pElement;
-        if (pElement < &pWinStaObj->pClipBase[pWinStaObj->cNumClipFormats])
-            Ret = pElement->fmt;
+        if (pElement != NULL)
+        {
+            ++pElement;
+            if (pElement < &pWinStaObj->pClipBase[pWinStaObj->cNumClipFormats])
+            {
+                Ret = pElement->fmt;
+            }
+        }
     }

cleanup: