netdev - [Patch net] net_sched: fix a missing idr_remove() in u32_delete

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Message-Id: <20180407001941.10752-1-xiyou.wangcong@gmail.com>
Date:   Fri,  6 Apr 2018 17:19:41 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: [Patch net] net_sched: fix a missing idr_remove() in u32_delete_key()

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@...tcenter.eu>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/sched/cls_u32.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index ed8b6a24b9e9..bac47b5d18fd 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -489,6 +489,7 @@ static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 				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;
-- 
2.13.0