lpc_eth: add missing ndo_change_mtu()

[ Upstream commit e30478598a8476d02e3b00caa89ce1a3b1dad54b ]

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@google.com>
Cc: Roland Stigge <stigge@antcom.de>
Cc: Kevin Wells <kevin.wells@nxp.com>
Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 6dfc26d85e4747bb645d577da44d8840a998405d..27934fdb288da19ae86e69ce053dc5c4cd4f4406 100644 (file)
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1310,6 +1310,7 @@ 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)