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e100: Release skb when DMA mapping is failed in e100_xmit_prepare

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When pci_dma_mapping_error in e100_xmit_prepare is failed, the skb buffer
allocated by netdev_alloc_skb_ip_align in e100_rx_alloc_skb is not
released, which causes a possible resource leak.
This patch adds error handling code to fix it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jia-Ju Bai 2015-08-03 10:40:48 +08:00 committed by Jeff Kirsher
parent 9ad607b4a9
commit 5e5d49422d
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/intel/e100.c
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@ -1770,8 +1770,11 @@ static int e100_xmit_prepare(struct nic *nic, struct cb *cb,
dma_addr = pci_map_single(nic->pdev,
skb->data, skb->len, PCI_DMA_TODEVICE);
/* If we can't map the skb, have the upper layer try later */
if (pci_dma_mapping_error(nic->pdev, dma_addr))
if (pci_dma_mapping_error(nic->pdev, dma_addr)) {
dev_kfree_skb_any(skb);
skb = NULL;
return -ENOMEM;
}
/*
* Use the last 4 bytes of the SKB payload packet as the CRC, used for