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natsemi: add checks for dma mapping errors 

refill_rx() and start_tx() do not check if mapping dma memory succeed.
The patch adds the checks and failure handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Khoroshilov 2015-12-19 15:13:49 +03:00 committed by David S. Miller
parent 179ccc0a73
commit 45af55006c
1 changed files with 12 additions and 0 deletions
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12
drivers/net/ethernet/natsemi/natsemi.c
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@ -1937,6 +1937,12 @@ static void refill_rx(struct net_device *dev)
break; /* Better luck next round. */
np->rx_dma[entry] = pci_map_single(np->pci_dev,
skb->data, buflen, PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(np->pci_dev,
np->rx_dma[entry])) {
dev_kfree_skb_any(skb);
np->rx_skbuff[entry] = NULL;
break; /* Better luck next round. */
}
np->rx_ring[entry].addr = cpu_to_le32(np->rx_dma[entry]);
}
np->rx_ring[entry].cmd_status = cpu_to_le32(np->rx_buf_sz);
@ -2093,6 +2099,12 @@ static netdev_tx_t start_tx(struct sk_buff *skb, struct net_device *dev)
np->tx_skbuff[entry] = skb;
np->tx_dma[entry] = pci_map_single(np->pci_dev,
skb->data,skb->len, PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(np->pci_dev, np->tx_dma[entry])) {
np->tx_skbuff[entry] = NULL;
dev_kfree_skb_irq(skb);
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
np->tx_ring[entry].addr = cpu_to_le32(np->tx_dma[entry]);