From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Fri, 6 Apr 2018 17:19:41 -0700
Subject: net_sched: fix a missing idr_remove() in u32_delete_key()
Patch-mainline: v4.17-rc1
Git-commit: f12c643209db0626f2f54780d86bb93bfa7a9c2d
References: bsc#1109837

When we delete a u32 key via u32_delete_key(), we forget to
call idr_remove() to remove its handle from IDR.

Fixes: e7614370d6f0 ("net_sched: use idr to allocate u32 filter handles")
Reported-by: Marcin Kabiesz <admin@hostcenter.eu>
Tested-by: Marcin Kabiesz <admin@hostcenter.eu>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/sched/cls_u32.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -490,6 +490,7 @@ static int u32_delete_key(struct tcf_pro
 				RCU_INIT_POINTER(*kp, key->next);
 
 				tcf_unbind_filter(tp, &key->res);
+				idr_remove(&ht->handle_idr, key->handle);
 				tcf_exts_get_net(&key->exts);
 				call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
 				return 0;