Index: /trunk/src/VBox/VMM/PDMAsyncCompletionFileCache.cpp
===================================================================
--- /trunk/src/VBox/VMM/PDMAsyncCompletionFileCache.cpp	(revision 27525)
+++ /trunk/src/VBox/VMM/PDMAsyncCompletionFileCache.cpp	(revision 27526)
@@ -1899,4 +1899,6 @@
                 pdmacFileEpCacheEntryRelease(pEntryAbove);
             }
+            else
+                cbToRead = cbRead;
 
             cbRead -= cbToRead;