netdev - [PATCH v2] ethernet: call __skb_pull() in eth_type

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Message-Id: <1272895972-13799-1-git-send-email-xiaosuo@gmail.com>
Date:	Mon,  3 May 2010 22:12:52 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH v2] ethernet: call __skb_pull() in eth_type_trans()

call __skb_pull() in eth_type_trans().

The callers of eth_type_trans() should always feed it long enough packets. When
the length of the packet is less than ETH_ZLEN, a warning message will be shown,
and the later behaviors are undefined.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
----
 net/ethernet/eth.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 61ec032..1df31cc 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -162,7 +162,10 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 
 	skb->dev = dev;
 	skb_reset_mac_header(skb);
-	skb_pull_inline(skb, ETH_HLEN);
+	if (unlikely(skb->len < ETH_ZLEN))
+		dev_warn(&dev->dev, "too small ethernet packet: %u bytes\n",
+			 skb->len);
+	__skb_pull(skb, ETH_HLEN);
 	eth = eth_hdr(skb);
 
 	if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
--
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