netdev - [PATCH] lpc_eth: add missing ndo_change

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Message-ID: <1339406640.6001.1896.camel@edumazet-glaptop>
Date:	Mon, 11 Jun 2012 11:24:00 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, stigge@...com.de,
	kevin.wells@....com, aletes.xgr@...il.com, srinivas.bakki@....com
Subject: [PATCH] lpc_eth: add missing ndo_change_mtu()

From: Eric Dumazet <edumazet@...gle.com>

lpc_eth does a copy of transmitted skbs to DMA area, without checking
skb lengths, so can trigger buffer overflows :

memcpy(pldat->tx_buff_v + txidx * ENET_MAXF_SIZE, skb->data, len);

One way to get bigger skbs is to allow MTU changes above the 1500 limit.

Calling eth_change_mtu() in ndo_change_mtu() makes sure this cannot
happen.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Roland Stigge <stigge@...com.de>
Cc: Kevin Wells <kevin.wells@....com>
---
diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 8d2666f..10febdc 100644
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1320,6 +1320,7 @@ static const struct net_device_ops lpc_netdev_ops = {
 	.ndo_set_rx_mode	= lpc_eth_set_multicast_list,
 	.ndo_do_ioctl		= lpc_eth_ioctl,
 	.ndo_set_mac_address	= lpc_set_mac_address,
+	.ndo_change_mtu		= eth_change_mtu,
 };
 
 static int lpc_eth_drv_probe(struct platform_device *pdev)


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