From a644d30ee7aaf84d3692d8840a85e2072bc9df57 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Wed, 28 Oct 2015 03:12:21 +0000
Subject: [PATCH] [AFD] - Fix WSAEnumNetworkEvents failing if no event was
 supplied (uTorrent issue - CORE-6656)

svn path=/trunk/; revision=69728
---
 reactos/drivers/network/afd/afd/select.c | 30 ++++++++++++++----------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/reactos/drivers/network/afd/afd/select.c b/reactos/drivers/network/afd/afd/select.c
index 2e30ca3ba2b..2835f9c2ef0 100644
--- a/reactos/drivers/network/afd/afd/select.c
+++ b/reactos/drivers/network/afd/afd/select.c
@@ -344,21 +344,25 @@ AfdEnumEvents( PDEVICE_OBJECT DeviceObject, PIRP Irp,
          return UnlockAndMaybeComplete( FCB, STATUS_NO_MEMORY, Irp, 0 );
     }
 
-    Status = ObReferenceObjectByHandle(EnumReq->Event,
-                                       EVENT_ALL_ACCESS,
-                                       *ExEventObjectType,
-                                       UserMode,
-                                       (PVOID *)&UserEvent,
-                                       NULL);
-    if (!NT_SUCCESS(Status))
+    /* An event may optionally be provided for us to clear */
+    if (EnumReq->Event != NULL)
     {
-        AFD_DbgPrint(MIN_TRACE,("Unable to reference event %x\n", Status));
-        return UnlockAndMaybeComplete(FCB, Status, Irp, 0);
-    }
+        Status = ObReferenceObjectByHandle(EnumReq->Event,
+                                           EVENT_ALL_ACCESS,
+                                           *ExEventObjectType,
+                                           UserMode,
+                                           (PVOID *)&UserEvent,
+                                           NULL);
+        if (!NT_SUCCESS(Status))
+        {
+            AFD_DbgPrint(MIN_TRACE,("Unable to reference event %x\n", Status));
+            return UnlockAndMaybeComplete(FCB, Status, Irp, 0);
+        }
 
-    /* Clear the event */
-    KeClearEvent(UserEvent);
-    ObDereferenceObject(UserEvent);
+        /* Clear the event */
+        KeClearEvent(UserEvent);
+        ObDereferenceObject(UserEvent);
+    }
 
     /* Copy the poll state, masking out disabled events */
     EnumReq->PollEvents = (FCB->PollState & ~FCB->EventSelectDisabled);