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sh_eth: Fix padding of short frames on TX

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If an skb to be transmitted is shorter than the minimum Ethernet frame
length, we currently set the DMA descriptor length to the minimum but
do not add zero-padding.  This could result in leaking sensitive
data.  We also pass different lengths to dma_map_single() and
dma_unmap_single().

Use skb_padto() to pad properly, before calling dma_map_single().

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2015-01-22 12:40:13 +00:00 committed by David S. Miller
parent 02a54164c5
commit eebfb643c0
1 changed files with 4 additions and 4 deletions
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8
drivers/net/ethernet/renesas/sh_eth.c
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@ -2117,6 +2117,9 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
}
spin_unlock_irqrestore(&mdp->lock, flags);
if (skb_padto(skb, ETH_ZLEN))
return NETDEV_TX_OK;
entry = mdp->cur_tx % mdp->num_tx_ring;
mdp->tx_skbuff[entry] = skb;
txdesc = &mdp->tx_ring[entry];
@ -2126,10 +2129,7 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
skb->len + 2);
txdesc->addr = dma_map_single(&ndev->dev, skb->data, skb->len,
DMA_TO_DEVICE);
if (skb->len < ETH_ZLEN)
txdesc->buffer_length = ETH_ZLEN;
else
txdesc->buffer_length = skb->len;
txdesc->buffer_length = skb->len;
if (entry >= mdp->num_tx_ring - 1)
txdesc->status |= cpu_to_edmac(mdp, TD_TACT | TD_TDLE);