[NTOSKRNL:CC] Fixing Synchronization Bug

Fixing Bug identified by PeyTy

NTOSKRNL/CC/ccloghandler.cpp

@@ -45,7 +45,7 @@ CcGetDirtyPages(IN PVOID LogHandle,
         if ((SharedCacheMap->Flags & 0x800) != 0) 
 		    {   
               DBGPRINT("CcGetDirtyPages::Invalid Flag \n")
-		      return;
+		      return (LARGE_INTEGER){0};
             }
 
         if ((SharedCacheMap->Flags & 0x2000000) != 0 && SharedCacheMap->LogHandle == LogHandle)
@@ -111,11 +111,13 @@ CcGetDirtyPages(IN PVOID LogHandle,
                     {
                         BcbToUnpin = Bcb;
                     }
+                    /*Release the BCB lock*/ 
+                   KeReleaseInStackQueuedSpinLock(&LockHandle);
                 }
+
             }
 
-            /*Release the BCB lock*/ 
-            KeReleaseInStackQueuedSpinLock(&LockHandle);
+            
 			
             /* Dereference the shared cache map file object*/
             CcDereferenceSharedCacheMapFileObject(SharedCacheMap, FileObject);
@@ -135,6 +137,7 @@ CcGetDirtyPages(IN PVOID LogHandle,
 		    KeReleaseQueuedSpinLock(LockQueueMasterLock,OldIrql);
         }
 }
+return OldestLsn ;
 
 }