netdev - Re: wan/hdlc_x25.c: fix a NULL dereference

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Message-ID: <m37i9tkxnf.fsf_-_@maximus.localdomain>
Date:	Wed, 03 Sep 2008 18:21:56 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Adrian Bunk <bunk@...nel.org>, netdev@...r.kernel.org
Subject: Re: wan/hdlc_x25.c: fix a NULL dereference

WAN: fixes a NULL dereference in hdlc_x25.

Reported-by: Adrian Bunk <bunk@...nel.org>.
Signed-off-by: Krzysztof Halasa <khc@...waw.pl>

diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c
index 8b7e5d2..cbcbf6f 100644
--- a/drivers/net/wan/hdlc_x25.c
+++ b/drivers/net/wan/hdlc_x25.c
@@ -163,15 +163,17 @@ static void x25_close(struct net_device *dev)
 
 static int x25_rx(struct sk_buff *skb)
 {
+	struct net_device *dev = skb->dev;
+
 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
-		skb->dev->stats.rx_dropped++;
+		dev->stats.rx_dropped++;
 		return NET_RX_DROP;
 	}
 
-	if (lapb_data_received(skb->dev, skb) == LAPB_OK)
+	if (lapb_data_received(dev, skb) == LAPB_OK)
 		return NET_RX_SUCCESS;
 
-	skb->dev->stats.rx_errors++;
+	dev->stats.rx_errors++;
 	dev_kfree_skb_any(skb);
 	return NET_RX_DROP;
 }
--
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