netdev - [PATCH] net: tc35815: move free after the dereference

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Date:   Fri, 21 Apr 2017 13:49:37 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:     Philippe Reynes <tremyfr@...il.com>,
        Jarod Wilson <jarod@...hat.com>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] net: tc35815: move free after the dereference

We dereference "skb" to get "skb->len" so we should probably do that
step before freeing the skb.

Fixes: eea221ce4880 ("tc35815 driver update (take 2)")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/net/ethernet/toshiba/tc35815.c b/drivers/net/ethernet/toshiba/tc35815.c
index ad6db05b97d6..d9db8a06afd2 100644
--- a/drivers/net/ethernet/toshiba/tc35815.c
+++ b/drivers/net/ethernet/toshiba/tc35815.c
@@ -1017,8 +1017,8 @@ tc35815_free_queues(struct net_device *dev)
 			BUG_ON(lp->tx_skbs[i].skb != skb);
 #endif
 			if (skb) {
-				dev_kfree_skb(skb);
 				pci_unmap_single(lp->pci_dev, lp->tx_skbs[i].skb_dma, skb->len, PCI_DMA_TODEVICE);
+				dev_kfree_skb(skb);
 				lp->tx_skbs[i].skb = NULL;
 				lp->tx_skbs[i].skb_dma = 0;
 			}