On Fri, Dec 24, 2010 at 8:27 AM, Florian Westphal <fw@xxxxxxxxx> wrote:
> broute table init hook sets up the "br_should_route_hook" pointer,
> which then gets called from br_input.
>
> commit a386f99025f13b32502fe5dedf223c20d7283826
> (bridge: add proper RCU annotation to should_route_hook)
> introduced a typedef, and then changed this to:
>
> br_should_route_hook_t *rhook;
> [..]
> rhook = rcu_dereference(br_should_route_hook);
> if (*rhook(skb))
>
> problem is that "br_should_route_hook" contains the address of the function,
> so calling *rhook() results in kernel panic.
>
> Can't simply use "if (rhook(skb)", because br_should_route_hook_t *rhook
> is not a function.
>
> Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
> ---
>
> include/linux/if_bridge.h | 2 +-
> net/bridge/br_input.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
> index f7e73c3..dd3f201 100644
> --- a/include/linux/if_bridge.h
> +++ b/include/linux/if_bridge.h
> @@ -103,7 +103,7 @@ struct __fdb_entry {
>
> extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
>
> -typedef int (*br_should_route_hook_t)(struct sk_buff *skb);
> +typedef int br_should_route_hook_t(struct sk_buff *skb);
> extern br_should_route_hook_t __rcu *br_should_route_hook;
>
> #endif
> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> index 6f6d8e1..1d677bf 100644
> --- a/net/bridge/br_input.c
> +++ b/net/bridge/br_input.c
> @@ -178,7 +178,7 @@ forward:
> case BR_STATE_FORWARDING:
> rhook = rcu_dereference(br_should_route_hook);
> if (rhook) {
> - if ((*rhook)(skb))
> + if (rhook(skb))
I don't think this change is necessary. Would you like to remove this
change and test again?
> return skb;
> dest = eth_hdr(skb)->h_dest;
> }
--
Regards,
Changli Gao(xiaosuo@xxxxxxxxx)
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
