[cgutman] 56331: [TCPIP] - Fix a crash when a NIC driver indicates the media state before we're expecting it - Fixes bug 6895

Author: cgutman
Date: Fri Apr  6 16:08:20 2012
New Revision: 56331

URL: http://svn.reactos.org/svn/reactos?rev=56331&view=rev
Log:
[TCPIP]
- Fix a crash when a NIC driver indicates the media state before we're expecting it
- Fixes bug 6895

Modified:
    trunk/reactos/drivers/network/tcpip/datalink/lan.c

Modified: trunk/reactos/drivers/network/tcpip/datalink/lan.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/network/tcpip/datal...
==============================================================================
--- trunk/reactos/drivers/network/tcpip/datalink/lan.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/network/tcpip/datalink/lan.c [iso-8859-1] Fri Apr  6 16:08:20 2012
@@ -810,6 +810,10 @@
     PRECONFIGURE_CONTEXT Context;

TI_DbgPrint(DEBUG_DATALINK, ("Called.\n"));
+
+    /* Ignore the status indication if we have no context yet. We'll get another later */
+    if (!Adapter->Context)
+        return;

Context = ExAllocatePool(NonPagedPool, sizeof(RECONFIGURE_CONTEXT));
     if (!Context)
@@ -1302,6 +1306,7 @@
     LLIP_BIND_INFO BindInfo;
     ULONG Lookahead = LOOKAHEAD_SIZE;
     NTSTATUS Status;
+    NDIS_MEDIA_STATE MediaState;

TI_DbgPrint(DEBUG_DATALINK, ("Called.\n"));

@@ -1384,12 +1389,30 @@
                           sizeof(UINT));
     if (NdisStatus != NDIS_STATUS_SUCCESS)
         return FALSE;
-    
+
     /* Register interface with IP layer */
     IPRegisterInterface(IF);

-    /* Set adapter state */
+    /* Store adapter context */
     Adapter->Context = IF;
+
+    /* Get the media state */
+    NdisStatus = NDISCall(Adapter,
+                          NdisRequestQueryInformation,
+                          OID_GEN_MEDIA_CONNECT_STATUS,
+                          &MediaState,
+                          sizeof(MediaState));
+    if (NdisStatus != NDIS_STATUS_SUCCESS) {
+        TI_DbgPrint(DEBUG_DATALINK, ("Could not query media status (0x%X).\n", NdisStatus));
+        IPUnregisterInterface(IF);
+        IPDestroyInterface(IF);
+        return FALSE;
+    }
+
+    /* Indicate the current media state */
+    ProtocolStatus(Adapter,
+                   (MediaState == NdisMediaStateConnected) ? NDIS_STATUS_MEDIA_CONNECT : NDIS_STATUS_MEDIA_DISCONNECT,
+                   NULL, 0);

/* Set packet filter so we can send and receive packets */
     NdisStatus = NDISCall(Adapter,
@@ -1404,9 +1427,6 @@
         IPDestroyInterface(IF);
         return FALSE;
     }
-    
-    /* Indicate media connect (our drivers are broken and don't do this) */
-    ProtocolStatus(Adapter, NDIS_STATUS_MEDIA_CONNECT, NULL, 0);

return TRUE;
 }