netfilter: nat: remove rcu_read_lock in __nf_nat_decode_session.

__nf_nat_decode_session is called from nf_nat_decode_session as decodefn.
before calling decodefn, it already set rcu_read_lock. so rcu_read_lock in
__nf_nat_decode_session can be removed.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 376c1b3..fb0e654 100644 (file)
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -71,11 +71,10 @@ static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl)
        if (ct == NULL)
                return;
 
-       family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
-       rcu_read_lock();
+       family = nf_ct_l3num(ct);
        l3proto = __nf_nat_l3proto_find(family);
        if (l3proto == NULL)
-               goto out;
+               return;
 
        dir = CTINFO2DIR(ctinfo);
        if (dir == IP_CT_DIR_ORIGINAL)
@@ -84,8 +83,6 @@ static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl)
                statusbit = IPS_SRC_NAT;
 
        l3proto->decode_session(skb, ct, dir, statusbit, fl);
-out:
-       rcu_read_unlock();
 }
 
 int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family)