2016-01-01 23:12:50

by Alexey Khoroshilov

Subject: [PATCH] ipw2x00: add checks for dma mapping errors

ipw2100_alloc_skb() and ipw2100_tx_send_data() 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 <[email protected]>
---
drivers/net/wireless/ipw2x00/ipw2100.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ipw2x00/ipw2100.c b/drivers/net/wireless/ipw2x00/ipw2100.c
index 36818c7f30b9..f93a7f71c047 100644
--- a/drivers/net/wireless/ipw2x00/ipw2100.c
+++ b/drivers/net/wireless/ipw2x00/ipw2100.c
@@ -2311,8 +2311,10 @@ static int ipw2100_alloc_skb(struct ipw2100_priv *priv,
packet->dma_addr = pci_map_single(priv->pci_dev, packet->skb->data,
sizeof(struct ipw2100_rx),
PCI_DMA_FROMDEVICE);
- /* NOTE: pci_map_single does not return an error code, and 0 is a valid
- * dma_addr */
+ if (pci_dma_mapping_error(priv->pci_dev, packet->dma_addr)) {
+ dev_kfree_skb(packet->skb);
+ return -ENOMEM;
+ }

return 0;
}
@@ -3183,6 +3185,11 @@ static void ipw2100_tx_send_data(struct ipw2100_priv *priv)
LIBIPW_3ADDR_LEN,
tbd->buf_length,
PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(priv->pci_dev,
+ tbd->host_addr)) {
+ IPW_DEBUG_TX("dma mapping error\n");
+ break;
+ }

IPW_DEBUG_TX("data frag tbd TX%d P=%08x L=%d\n",
txq->next, tbd->host_addr,
--
1.9.1

2016-01-07 09:19:21

by Kalle Valo

Subject: Re: ipw2x00: add checks for dma mapping errors

> ipw2100_alloc_skb() and ipw2100_tx_send_data() 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 <[email protected]>

Thanks, applied to wireless-drivers-next.git.

Kalle Valo