netdev - Re: [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf

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Date:   Mon, 30 Aug 2021 11:05:51 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Xiyu Yang <xiyuyang19@...an.edu.cn>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get
 tcf_block failed

On Sun, 29 Aug 2021 23:58:01 +0800 Xiyu Yang wrote:
> The reference counting issue happens in one exception handling path of
> cbq_change_class(). When failing to get tcf_block, the function forgets
> to decrease the refcount of "rtab" increased by qdisc_put_rtab(),
> causing a refcount leak.
> 
> Fix this issue by jumping to "failure" label when get tcf_block failed.
> 
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>

Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")