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authorPavel Emelyanov <xemul@openvz.org>2007-12-13 12:57:24 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2007-12-14 10:32:01 -0800
commitefdd016aec960e4b4ace07cb77c36e98caa296f4 (patch)
tree69526d1048fa8f370a026bac9e9fe9e0fc75257d
parent2370eae7567e06b10f68ce293cb2a6b4f773b0c7 (diff)
BRIDGE: Properly dereference the br_should_route_hook
[BRIDGE]: Properly dereference the br_should_route_hook [ Upstream commit: 82de382ce8e1c7645984616728dc7aaa057821e4 ] This hook is protected with the RCU, so simple if (br_should_route_hook) br_should_route_hook(...) is not enough on some architectures. Use the rcu_dereference/rcu_assign_pointer in this case. Fixed Stephen's comment concerning using the typeof(). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/bridge/br_input.c7
-rw-r--r--net/bridge/netfilter/ebtable_broute.c4
2 files changed, 6 insertions, 5 deletions
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 420bbb9955e9..fb2c7cc6bb7e 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -127,6 +127,7 @@ static inline int is_link_local(const unsigned char *dest)
struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
{
const unsigned char *dest = eth_hdr(skb)->h_dest;
+ int (*rhook)(struct sk_buff **pskb);
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
goto drop;
@@ -148,9 +149,9 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
switch (p->state) {
case BR_STATE_FORWARDING:
-
- if (br_should_route_hook) {
- if (br_should_route_hook(&skb))
+ rhook = rcu_dereference(br_should_route_hook);
+ if (rhook != NULL) {
+ if (rhook(&skb))
return skb;
dest = eth_hdr(skb)->h_dest;
}
diff --git a/net/bridge/netfilter/ebtable_broute.c b/net/bridge/netfilter/ebtable_broute.c
index d37ce0478938..bc17cf529802 100644
--- a/net/bridge/netfilter/ebtable_broute.c
+++ b/net/bridge/netfilter/ebtable_broute.c
@@ -70,13 +70,13 @@ static int __init ebtable_broute_init(void)
if (ret < 0)
return ret;
/* see br_input.c */
- br_should_route_hook = ebt_broute;
+ rcu_assign_pointer(br_should_route_hook, ebt_broute);
return ret;
}
static void __exit ebtable_broute_fini(void)
{
- br_should_route_hook = NULL;
+ rcu_assign_pointer(br_should_route_hook, NULL);
synchronize_net();
ebt_unregister_table(&broute_table);
}