netfilter 23/31: bridge: refcount fix

[Patrick McHardy <kaber@trash.net>]

commit f3abc9b963e004b8c96cd7fbee6fd905f2bfd620
Author: Eric Dumazet <eric.dumazet@gmail.com>
Date:   Mon Aug 24 19:35:38 2009 +0200

    netfilter: bridge: refcount fix
    
    commit f216f082b2b37c4943f1e7c393e2786648d48f6f
    ([NETFILTER]: bridge netfilter: deal with martians correctly)
    added a refcount leak on in_dev.
    
    Instead of using in_dev_get(), we can use __in_dev_get_rcu(),
    as netfilter hooks are running under rcu_read_lock(), as pointed
    by Patrick.
    
    Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 4fde742..907a82e 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -359,7 +359,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
 				},
 				.proto = 0,
 			};
-			struct in_device *in_dev = in_dev_get(dev);
+			struct in_device *in_dev = __in_dev_get_rcu(dev);
 
 			/* If err equals -EHOSTUNREACH the error is due to a
 			 * martian destination or due to the fact that