[Patch net] act_ipt: fix a bind refcnt leak

[Cong Wang]

And avoid calling tcf_hash_check() twice.

Fixes: a57f19d30b2d ("net sched: ipt action fix late binding")
Cc: Jamal Hadi Salim <j...@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 net/sched/act_ipt.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 9f002ad..d4bd19e 100644
--- 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)
-- 
2.1.0