netdev - Re: [PATCH] lpc_eth: add missing ndo_change

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Date:	Mon, 11 Jun 2012 11:36:29 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, kevin.wells@....com,
	aletes.xgr@...il.com, srinivas.bakki@....com
Subject: Re: [PATCH] lpc_eth: add missing ndo_change_mtu()

On 06/11/2012 11:24 AM, Eric Dumazet wrote:
> 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>

Acked-by: Roland Stigge <stigge@...com.de>

> 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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