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net/sched: act_tunnel_key: Remove rcu_read_lock protection 

Remove rcu_read_lock protection from tunnel_key_dump and use
rtnl_dereference, dump operation is protected by  rtnl lock.

Also, remove rcu_read_lock from tunnel_key_release and use
rcu_dereference_protected.

Both operations are running exclusively and a writer couldn't modify
t->params while those functions are executed.

Fixes: 54d94fd89d90 ('net/sched: Introduce act_tunnel_key')
Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hadar Hen Zion 2016-09-12 15:19:21 +03:00 committed by David S. Miller
parent 5c0ca3f566
commit 07c0f09e23
1 changed files with 4 additions and 13 deletions
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17
net/sched/act_tunnel_key.c
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@ -194,15 +194,12 @@ static void tunnel_key_release(struct tc_action *a, int bind)
struct tcf_tunnel_key *t = to_tunnel_key(a);
struct tcf_tunnel_key_params *params;
rcu_read_lock();
params = rcu_dereference(t->params);
params = rcu_dereference_protected(t->params, 1);
if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
dst_release(&params->tcft_enc_metadata->dst);
kfree_rcu(params, rcu);
rcu_read_unlock();
}
static int tunnel_key_dump_addresses(struct sk_buff *skb,
@ -245,10 +242,8 @@ static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
.bindcnt = t->tcf_bindcnt - bind,
};
struct tcf_t tm;
int ret = -1;
rcu_read_lock();
params = rcu_dereference(t->params);
params = rtnl_dereference(t->params);
opt.t_action = params->tcft_action;
opt.action = params->action;
@ -272,15 +267,11 @@ static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
&tm, TCA_TUNNEL_KEY_PAD))
goto nla_put_failure;
ret = skb->len;
goto out;
return skb->len;
nla_put_failure:
nlmsg_trim(skb, b);
out:
rcu_read_unlock();
return ret;
return -1;
}
static int tunnel_key_walker(struct net *net, struct sk_buff *skb,