From 9c25614cf4cf16056dd5aeca28811e53f2b74d2d Mon Sep 17 00:00:00 2001
From: Richard Barry <ribarry@amazon.com>
Date: Mon, 26 Sep 2011 14:47:08 +0000
Subject: [PATCH] Add an assert in the Win32 lwIP port layer to catch invalid
 adapter numbers being used.

---
 Demo/Common/ethernet/lwip-1.4.0/ports/win32/ethernetif.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Demo/Common/ethernet/lwip-1.4.0/ports/win32/ethernetif.c b/Demo/Common/ethernet/lwip-1.4.0/ports/win32/ethernetif.c
index 071e4bfab8..881beb7eab 100644
--- a/Demo/Common/ethernet/lwip-1.4.0/ports/win32/ethernetif.c
+++ b/Demo/Common/ethernet/lwip-1.4.0/ports/win32/ethernetif.c
@@ -453,6 +453,15 @@ struct xEthernetIf *pxEthernetIf;
   
 		/* initialize the hardware */
 		prvLowLevelInit( pxNetIf );
+
+		/* Was an interface opened? */
+		if( pxOpenedInterfaceHandle == NULL )
+		{
+			/* Probably an invalid adapter number was defined in 
+			FreeRTOSConfig.h. */
+			xReturn = ERR_VAL;
+			configASSERT( pxOpenedInterfaceHandle );
+		}
 	}
 
 	return xReturn;