[gschneider] 42520: Don't access the device mode if it is not passed (user32 monitor crash)

Author: gschneider
Date: Sat Aug  8 18:01:24 2009
New Revision: 42520

URL: http://svn.reactos.org/svn/reactos?rev=42520&view=rev
Log:
Don't access the device mode if it is not passed (user32 monitor crash)

Modified:
    trunk/reactos/subsystems/win32/win32k/objects/device.c

Modified: trunk/reactos/subsystems/win32/win32k/objects/device.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/device.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/device.c [iso-8859-1] Sat Aug  8
18:01:24 2009
@@ -1493,13 +1493,16 @@
         return Status;
     }
 
-    DPRINT("DevMode->dmSize = %d\n", pDevMode->dmSize);
-    DPRINT("DevMode->dmExtraSize = %d\n", pDevMode->dmDriverExtra);
-    if (pDevMode->dmSize != SIZEOF_DEVMODEW_300 &&
-            pDevMode->dmSize != SIZEOF_DEVMODEW_400 &&
-            pDevMode->dmSize != SIZEOF_DEVMODEW_500)
-    {
-        return STATUS_BUFFER_TOO_SMALL;
+    if (pDevMode != NULL)
+    {
+        DPRINT("DevMode->dmSize = %d\n", pDevMode->dmSize);
+        DPRINT("DevMode->dmExtraSize = %d\n", pDevMode->dmDriverExtra);
+        if (pDevMode->dmSize != SIZEOF_DEVMODEW_300 &&
+                pDevMode->dmSize != SIZEOF_DEVMODEW_400 &&
+                pDevMode->dmSize != SIZEOF_DEVMODEW_500)
+        {
+            return STATUS_BUFFER_TOO_SMALL;
+        }
     }
 
     if (iModeNum == ENUM_CURRENT_SETTINGS)
@@ -1695,9 +1698,12 @@
 
     ASSERT(CachedMode != NULL);
 
-    RtlCopyMemory(pDevMode, CachedMode, min(pDevMode->dmSize,
CachedMode->dmSize));
-    RtlZeroMemory(pDevMode + pDevMode->dmSize, pDevMode->dmDriverExtra);
-    RtlCopyMemory(pDevMode + min(pDevMode->dmSize, CachedMode->dmSize), CachedMode
+ CachedMode->dmSize, min(pDevMode->dmDriverExtra, CachedMode->dmDriverExtra));
+    if (pDevMode != NULL)
+    {
+        RtlCopyMemory(pDevMode, CachedMode, min(pDevMode->dmSize,
CachedMode->dmSize));
+        RtlZeroMemory(pDevMode + pDevMode->dmSize, pDevMode->dmDriverExtra);
+        RtlCopyMemory(pDevMode + min(pDevMode->dmSize, CachedMode->dmSize),
CachedMode + CachedMode->dmSize, min(pDevMode->dmDriverExtra,
CachedMode->dmDriverExtra));
+    }
 
     return STATUS_SUCCESS;
 }