diff options
| author | Pavel Emelyanov <xemul@openvz.org> | 2007-12-13 12:57:24 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-12-14 10:32:01 -0800 |
| commit | efdd016aec960e4b4ace07cb77c36e98caa296f4 (patch) | |
| tree | 69526d1048fa8f370a026bac9e9fe9e0fc75257d | |
| parent | 2370eae7567e06b10f68ce293cb2a6b4f773b0c7 (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.c | 7 | ||||
| -rw-r--r-- | net/bridge/netfilter/ebtable_broute.c | 4 |
2 files changed, 6 insertions, 5 deletions
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 420bbb9955e..fb2c7cc6bb7 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 d37ce047893..bc17cf52980 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); } |