From: Hong Zhiguo Date: Sat, 14 Sep 2013 14:42:27 +0000 (+0800) Subject: bridge: use br_port_get_rtnl within rtnl lock X-Git-Tag: firefly_0821_release~6453^2~626 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=97ddc3e1f9d6637c81aaa470fde5669ffb854d14;p=firefly-linux-kernel-4.4.55.git 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index f66a03453a8e..06873e80a432 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -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 diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index d11a5e1fbced..84e081060b66 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -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;