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e100: Release skb when DMA mapping is failed in e100_xmit_prepare
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>
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@ -1770,8 +1770,11 @@ static int e100_xmit_prepare(struct nic *nic, struct cb *cb,
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dma_addr = pci_map_single(nic->pdev,
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skb->data, skb->len, PCI_DMA_TODEVICE);
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/* If we can't map the skb, have the upper layer try later */
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if (pci_dma_mapping_error(nic->pdev, dma_addr))
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if (pci_dma_mapping_error(nic->pdev, dma_addr)) {
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dev_kfree_skb_any(skb);
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skb = NULL;
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return -ENOMEM;
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}
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/*
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* Use the last 4 bytes of the SKB payload packet as the CRC, used for
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