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net: moxa: replace build_skb() with netdev_alloc_skb_ip_align() / memcpy()

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build_skb() is used to make skbs out of existing RX ring memory
which is bad because the RX ring is allocated only once, on probe.
Memory corruption occur because said memory is reclaimed, i.e.
__kfree_skb() (and eventually put_page()).

Replace build_skb() with netdev_alloc_skb_ip_align() and use memcpy().

Remove SKB_DATA_ALIGN() from RX buffer size while we're at it.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=69041

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jonas Jensen 2014-08-25 16:22:22 +02:00 committed by David S. Miller
parent b853f31940
commit 9fe1b3bc8d
1 changed files with 5 additions and 4 deletions
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9
drivers/net/ethernet/moxa/moxart_ether.c
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@ -226,13 +226,15 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
if (len > RX_BUF_SIZE)
len = RX_BUF_SIZE;
skb = build_skb(priv->rx_buf[rx_head], priv->rx_buf_size);
skb = netdev_alloc_skb_ip_align(ndev, len);
if (unlikely(!skb)) {
net_dbg_ratelimited("build_skb failed\n");
net_dbg_ratelimited("netdev_alloc_skb_ip_align failed\n");
priv->stats.rx_dropped++;
priv->stats.rx_errors++;
}
memcpy(skb->data, priv->rx_buf[rx_head], len);
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, ndev);
napi_gro_receive(&priv->napi, skb);
@ -464,8 +466,7 @@ static int moxart_mac_probe(struct platform_device *pdev)
spin_lock_init(&priv->txlock);
priv->tx_buf_size = TX_BUF_SIZE;
priv->rx_buf_size = RX_BUF_SIZE +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
priv->rx_buf_size = RX_BUF_SIZE;
priv->tx_desc_base = dma_alloc_coherent(NULL, TX_REG_DESC_SIZE *
TX_DESC_NUM, &priv->tx_base,