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netfilter: nfnetlink: remove redundant variable nskb 

Actually after netlink_skb_clone() is called, the nskb and
skb will point to the same thing, but they are used just like
they are different, sometimes this is confusing, so i think
there is no necessary to keep nskb anymore.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@soleta.eu>
This commit is contained in:
Duan Jiong 2014-12-10 17:21:59 +08:00 committed by Pablo Neira Ayuso
parent 8aefc4d1c6
commit 0f8162326f
1 changed files with 7 additions and 8 deletions
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15
net/netfilter/nfnetlink.c
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@ -272,7 +272,7 @@ static void nfnl_err_deliver(struct list_head *err_list, struct sk_buff *skb)
static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
u_int16_t subsys_id)
{
struct sk_buff *nskb, *oskb = skb;
struct sk_buff *oskb = skb;
struct net *net = sock_net(skb->sk);
const struct nfnetlink_subsystem *ss;
const struct nfnl_callback *nc;
@ -283,12 +283,11 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
if (subsys_id >= NFNL_SUBSYS_COUNT)
return netlink_ack(skb, nlh, -EINVAL);
replay:
nskb = netlink_skb_clone(oskb, GFP_KERNEL);
if (!nskb)
skb = netlink_skb_clone(oskb, GFP_KERNEL);
if (!skb)
return netlink_ack(oskb, nlh, -ENOMEM);
nskb->sk = oskb->sk;
skb = nskb;
skb->sk = oskb->sk;
nfnl_lock(subsys_id);
ss = rcu_dereference_protected(table[subsys_id].subsys,
@ -305,7 +304,7 @@ replay:
{
nfnl_unlock(subsys_id);
netlink_ack(skb, nlh, -EOPNOTSUPP);
return kfree_skb(nskb);
return kfree_skb(skb);
}
}
@ -385,7 +384,7 @@ replay:
nfnl_err_reset(&err_list);
ss->abort(oskb);
nfnl_unlock(subsys_id);
kfree_skb(nskb);
kfree_skb(skb);
goto replay;
}
}
@ -426,7 +425,7 @@ done:
nfnl_err_deliver(&err_list, oskb);
nfnl_unlock(subsys_id);
kfree_skb(nskb);
kfree_skb(skb);
}
static void nfnetlink_rcv(struct sk_buff *skb)