netdev - [PATCH] net: l2tp_eth: fix l2tp_eth_dev

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Date:	Mon, 25 Jun 2012 12:45:14 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	James Chapman <jchapman@...alix.com>
Subject: [PATCH] net: l2tp_eth: fix l2tp_eth_dev_xmit race

From: Eric Dumazet <edumazet@...gle.com>

Its illegal to dereference skb after giving it to l2tp_xmit_skb()
as it might be already freed/reused.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: James Chapman <jchapman@...alix.com>
---
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 185f12f..c3738f4 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -88,12 +88,12 @@ static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct l2tp_eth *priv = netdev_priv(dev);
 	struct l2tp_session *session = priv->session;
 
-	l2tp_xmit_skb(session, skb, session->hdr_len);
-
 	dev->stats.tx_bytes += skb->len;
 	dev->stats.tx_packets++;
 
-	return 0;
+	l2tp_xmit_skb(session, skb, session->hdr_len);
+
+	return NETDEV_TX_OK;
 }
 
 static struct net_device_ops l2tp_eth_netdev_ops = {


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