tg3: Fix DMA mapping leak in tigon3_dma_hwbug_workaround().

Noticed by Michael Chan.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 355e8bcf6fed..123920759efd 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -4631,6 +4631,9 @@ static int tigon3_dma_hwbug_workaround(struct tg3 *tp, struct sk_buff *skb,
                  * Drop the packet if it does.
                  */
                 if (ret || tg3_4g_overflow_test(new_addr, new_skb->len)) {
+                        if (!ret)
+                                skb_dma_unmap(&tp->pdev->dev, new_skb,
+                                              DMA_TO_DEVICE);
                         ret = -1;
                         dev_kfree_skb(new_skb);
                         new_skb = NULL;