netdev - [PATCH net-next] fix NULL pointer dereference in br_handle

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Message-Id: <1379001428-2727-1-git-send-email-zhiguohong@tencent.com>
Date:	Thu, 12 Sep 2013 23:57:08 +0800
From:	Hong Zhiguo <honkiko@...il.com>
To:	vyasevic@...hat.com
Cc:	eric.dumazet@...il.com, davem@...emloft.net,
	netdev@...r.kernel.org, Hong Zhiguo <zhiguohong@...cent.com>
Subject: [PATCH net-next] fix NULL pointer dereference in br_handle_frame

not check IFF_BRIDGE_PORT within br_handle_frame

Signed-off-by: Hong Zhiguo <zhiguohong@...cent.com>
---
 net/bridge/br_input.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index a2fd37e..da4714a 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -60,7 +60,7 @@ static int br_pass_frame_up(struct sk_buff *skb)
 int br_handle_frame_finish(struct sk_buff *skb)
 {
 	const unsigned char *dest = eth_hdr(skb)->h_dest;
-	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
+	enet_bridge_port *p = rcu_dereference(skb->dev->rx_handler_data);
 	struct net_bridge *br;
 	struct net_bridge_fdb_entry *dst;
 	struct net_bridge_mdb_entry *mdst;
@@ -143,7 +143,7 @@ drop:
 /* note: already called with rcu_read_lock */
 static int br_handle_local_finish(struct sk_buff *skb)
 {
-	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
+	struct net_bridge_port *p = rcu_dereference(skb->dev->rx_handler_data);
 	u16 vid = 0;
 
 	br_vlan_get_tag(skb, &vid);
@@ -173,7 +173,7 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
 	if (!skb)
 		return RX_HANDLER_CONSUMED;
 
-	p = br_port_get_rcu(skb->dev);
+	p = rcu_dereference(skb->dev->rx_handler_data);
 
 	if (unlikely(is_link_local_ether_addr(dest))) {
 		/*
-- 
1.7.0.4

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