netdev - [PATCH 1/1] netfilter: ebtables: make broute table work again

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 24 Dec 2010 01:27:16 +0100
From:	Florian Westphal <fw@...len.de>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Florian Westphal <fw@...len.de>
Subject: [PATCH 1/1] netfilter: ebtables: make broute table work again

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@...len.de>
---

 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))
 				return skb;
 			dest = eth_hdr(skb)->h_dest;
 		}
-- 
1.7.2.2

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html