netdev - [patch net-next] net: sched: fix block->refcnt decrement

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Date:   Wed,  8 Aug 2018 14:04:13 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
        vladbu@...lanox.com, mlxsw@...lanox.com
Subject: [patch net-next] net: sched: fix block->refcnt decrement

From: Jiri Pirko <jiri@...lanox.com>

Currently the refcnt is never decremented in case the value is not 1.
Fix it by adding decrement in case the refcnt is not 1.

Reported-by: Vlad Buslov <vladbu@...lanox.com>
Fixes: f71e0ca4db18 ("net: sched: Avoid implicit chain 0 creation")
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 net/sched/cls_api.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 194c2e0b2737..f922ce27ed5e 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -780,6 +780,8 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
 		block->refcnt--;
 		if (list_empty(&block->chain_list))
 			kfree(block);
+	} else {
+		block->refcnt--;
 	}
 }
 EXPORT_SYMBOL(tcf_block_put_ext);
-- 
2.14.4