[PATCH 3.19.y-ckt 121/130] act_pedit: check binding before calling tcf_hash_release()

[Kamal Mostafa]

3.19.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: WANG Cong <xiyou.wangcong@xxxxxxxxx>

commit 5175f7106cc55a1bcf97bf7d5ba0900017ebcef8 upstream.

When we share an action within a filter, the bind refcnt
should increase, therefore we should not call tcf_hash_release().

Fixes: 1a29321ed045 ("net_sched: act: Dont increment refcnt on replace")
Cc: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Signed-off-by: Cong Wang <cwang@xxxxxxxxxxxxxxxx>
Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
 net/sched/act_pedit.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index 59649d5..4298e8d 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -68,13 +68,12 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 		}
 		ret = ACT_P_CREATED;
 	} else {
-		p = to_pedit(a);
-		tcf_hash_release(a, bind);
 		if (bind)
 			return 0;
+		tcf_hash_release(a, bind);
 		if (!ovr)
 			return -EEXIST;
-
+		p = to_pedit(a);
 		if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
 			keys = kmalloc(ksize, GFP_KERNEL);
 			if (keys == NULL)
-- 
1.9.1

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