[PATCH] net: adaptec: starfire: add checks for dma mapping errors

[Alexey Khoroshilov]

init_ring() and refill_rx_ring() don't 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 <khoroshi...@ispras.ru>
---
 drivers/net/ethernet/adaptec/starfire.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/ethernet/adaptec/starfire.c 
b/drivers/net/ethernet/adaptec/starfire.c
index c12d2618eebf..e27043d051e1 100644
--- a/drivers/net/ethernet/adaptec/starfire.c
+++ b/drivers/net/ethernet/adaptec/starfire.c
@@ -1152,6 +1152,12 @@ static void init_ring(struct net_device *dev)
                if (skb == NULL)
                        break;
                np->rx_info[i].mapping = pci_map_single(np->pci_dev, skb->data, 
np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+               if (pci_dma_mapping_error(np->pci_dev,
+                                         np->rx_info[i].mapping)) {
+                       dev_kfree_skb(skb);
+                       np->rx_info[i].skb = NULL;
+                       break;
+               }
                /* Grrr, we cannot offset to correctly align the IP header. */
                np->rx_ring[i].rxaddr = cpu_to_dma(np->rx_info[i].mapping | 
RxDescValid);
        }
@@ -1569,6 +1575,12 @@ static void refill_rx_ring(struct net_device *dev)
                                break;  /* Better luck next round. */
                        np->rx_info[entry].mapping =
                                pci_map_single(np->pci_dev, skb->data, 
np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                       if (pci_dma_mapping_error(np->pci_dev,
+                                               np->rx_info[entry].mapping)) {
+                               dev_kfree_skb(skb);
+                               np->rx_info[entry].skb = NULL;
+                               break;
+                       }
                        np->rx_ring[entry].rxaddr =
                                cpu_to_dma(np->rx_info[entry].mapping | 
RxDescValid);
                }
-- 
2.7.4