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bridge: use br_port_get_rtnl within rtnl lock 

[ Upstream commit 1fb1754a8c70d69ab480763c423e0a74369c4a67 ]

current br_port_get_rcu is problematic in bridging path
(NULL deref). Change these calls in netlink path first.

Signed-off-by: Hong Zhiguo <zhiguohong@tencent.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hong Zhiguo 2013-09-14 22:42:27 +08:00 committed by Greg Kroah-Hartman
parent dc45b846e9
commit 97ddc3e1f9
2 changed files with 3 additions and 3 deletions
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4
net/bridge/br_netlink.c
View File

@ -203,7 +203,7 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
struct net_device *dev, u32 filter_mask)
{
int err = 0;
struct net_bridge_port *port = br_port_get_rcu(dev);
struct net_bridge_port *port = br_port_get_rtnl(dev);
/* not a bridge port and */
if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
@ -443,7 +443,7 @@ static size_t br_get_link_af_size(const struct net_device *dev)
struct net_port_vlans *pv;
if (br_port_exists(dev))
pv = nbp_get_vlan_info(br_port_get_rcu(dev));
pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
else if (dev->priv_flags & IFF_EBRIDGE)
pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
else

2
net/bridge/br_private.h
View File

@ -189,7 +189,7 @@ static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *d
return br_port_exists(dev) ? port : NULL;
}
static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
{
return br_port_exists(dev) ?
rtnl_dereference(dev->rx_handler_data) : NULL;