[cwittich] 67557: [NTVDM] don't try to deference an uninitialized Timer

Author: cwittich
Date: Tue May  5 08:07:08 2015
New Revision: 67557

URL: http://svn.reactos.org/svn/reactos?rev=67557&view=rev
Log:
[NTVDM]
don't try to deference an uninitialized Timer

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/clock.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/clock.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/cloc…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/clock.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/clock.c	[iso-8859-1] Tue May  5 08:07:08 2015
@@ -188,8 +188,12 @@
 
 VOID DestroyHardwareTimer(PHARDWARE_TIMER Timer)
 {
-    if (Timer->Flags & HARDWARE_TIMER_ENABLED)
RemoveEntryList(&Timer->Link);
-    RtlFreeHeap(RtlGetProcessHeap(), 0, Timer);
+    if (Timer)
+    {
+        if (Timer->Flags & HARDWARE_TIMER_ENABLED)
RemoveEntryList(&Timer->Link);
+        RtlFreeHeap(RtlGetProcessHeap(), 0, Timer);
+        Timer = NULL;
+    }
 }
 
 BOOLEAN ClockInitialize(VOID)