From: Alexey Khoroshilov Date: Fri, 1 Jan 2016 23:12:38 +0000 (+0300) Subject: ipw2x00: add checks for dma mapping errors X-Git-Tag: v4.5-rc1~128^2~20^2~16 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f7b7caa488eb209f1c63cc98104407c62753e406;p=platform%2Fkernel%2Flinux-exynos.git 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 Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2100.c b/drivers/net/wireless/intel/ipw2x00/ipw2100.c index 36818c7..f93a7f7 100644 --- a/drivers/net/wireless/intel/ipw2x00/ipw2100.c +++ b/drivers/net/wireless/intel/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,