linux-kernel - [PATCH 3.12 010/206] vxlan: fix a free after use

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Message-Id: <4cb545d54ca5815e9a2d56daef266a39096e6157.1416319692.git.jslaby@suse.cz>
Date:	Tue, 18 Nov 2014 15:06:05 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Li RongQing <roy.qing.li@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.12 010/206] vxlan: fix a free after use

From: Li RongQing <roy.qing.li@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit 7a9f526fc3ee49b6034af2f243676ee0a27dcaa8 ]

pskb_may_pull maybe change skb->data and make eth pointer oboslete,
so eth needs to reload

Fixes: 91269e390d062 ("vxlan: using pskb_may_pull as early as possible")
Cc: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Li RongQing <roy.qing.li@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/vxlan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index aff1694d2d9e..23969eaf88c1 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1897,6 +1897,7 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
 				    msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
 					return neigh_reduce(dev, skb);
 		}
+		eth = eth_hdr(skb);
 #endif
 	}
 
-- 
2.1.3

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