[jimtabor] 60865: - Fix condition when lParam is null and not allow it to go into exception.

Author: jimtabor
Date: Mon Nov  4 04:26:40 2013
New Revision: 60865

URL: http://svn.reactos.org/svn/reactos?rev=60865&view=rev
Log:
- Fix condition when lParam is null and not allow it to go into exception.

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

Modified: trunk/reactos/win32ss/user/ntuser/message.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/win32ss/user/ntuser/message...
==============================================================================
--- trunk/reactos/win32ss/user/ntuser/message.c	[iso-8859-1] (original)
+++ trunk/reactos/win32ss/user/ntuser/message.c	[iso-8859-1] Mon Nov  4 04:26:40 2013
@@ -174,7 +174,14 @@
         }
         else if (MMS_SIZE_LPARAMSZ == MsgMemoryEntry->Size)
         {
-            Size = (UINT) ((wcslen((PWSTR) lParam) + 1) * sizeof(WCHAR));
+            // WM_SETTEXT and WM_SETTINGCHANGE can be null!
+            if (!lParam)
+            {
+               TRACE("lParam is NULL!\n");
+               Size = 0;
+            }
+            else
+               Size = (UINT) ((wcslen((PWSTR) lParam) + 1) * sizeof(WCHAR));
         }
         else if (MMS_SIZE_SPECIAL == MsgMemoryEntry->Size)
         {
@@ -436,6 +443,7 @@
         /* Copy data if required */
         if (0 != (MsgMemoryEntry->Flags & MMS_FLAG_READ))
         {
+            TRACE("Copy Message %d from usermode buffer\n", KernelModeMsg->message);
             Status = MmCopyFromCaller(KernelMem, (PVOID) UserModeMsg->lParam, Size);
             if (! NT_SUCCESS(Status))
             {