act_ipt: fix a bind refcnt leak

And avoid calling tcf_hash_check() twice.

Fixes: a57f19d30b2d ("net sched: ipt action fix late binding")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 9f002ada7074ccdb648433b443870562962c8694..d4bd19ee5822d4849cbf6c473d3245fb2cbff094 100644 (file)
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -121,10 +121,13 @@ static int __tcf_ipt_init(struct tc_action_net *tn, struct nlattr *nla,
        }
 
        td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
-       if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
+       if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
+               if (exists)
+                       tcf_hash_release(a, bind);
                return -EINVAL;
+       }
 
-       if (!tcf_hash_check(tn, index, a, bind)) {
+       if (!exists) {
                ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind,
                                      false);
                if (ret)