Index: drivers/usb/usbehci/usb_request.cpp
===================================================================
--- drivers/usb/usbehci/usb_request.cpp	(revision 74004)
+++ drivers/usb/usbehci/usb_request.cpp	(working copy)
@@ -1602,6 +1602,10 @@
         *UrbStatusCode = m_UrbStatusCode;
     }
 
+    //
+    // free event
+    //
+    ExFreePoolWithTag(m_CompletionEvent, TAG_USBEHCI);
 }
 
 //-----------------------------------------------------------------------------------------
Index: drivers/usb/usbohci/usb_request.cpp
===================================================================
--- drivers/usb/usbohci/usb_request.cpp	(revision 74004)
+++ drivers/usb/usbohci/usb_request.cpp	(working copy)
@@ -1662,6 +1662,10 @@
         *UrbStatusCode = m_UrbStatusCode;
     }
 
+    //
+    // free event
+    //
+    ExFreePoolWithTag(m_CompletionEvent, TAG_USBOHCI);
 }
 
 VOID
Index: drivers/usb/usbuhci/usb_request.cpp
===================================================================
--- drivers/usb/usbuhci/usb_request.cpp	(revision 74004)
+++ drivers/usb/usbuhci/usb_request.cpp	(working copy)
@@ -671,6 +671,10 @@
         *UrbStatusCode = m_UrbStatusCode;
     }
 
+    //
+    // free event
+    //
+    ExFreePoolWithTag(m_CompletionEvent, TAG_USBUHCI);
 }
 
 //-----------------------------------------------------------------------------------------