netdev - Re: [Patch net 2/2] net_sched: always call ->destroy when ->init() fails

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Date:	Fri, 24 Oct 2014 17:40:26 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <cwang@...pensource.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Wang Bo <wang.bo116@....com.cn>,
	John Fastabend <john.r.fastabend@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Patrick McHardy <kaber@...sh.net>, Terry Lam <vtlam@...gle.com>
Subject: Re: [Patch net 2/2] net_sched: always call ->destroy when ->init()
 fails

On Fri, 2014-10-24 at 17:36 -0700, Cong Wang wrote:

> >>  static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)
> >> diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
> >> index 3ec7e88..55ac6a4 100644
> >> --- a/net/sched/sch_qfq.c
> >> +++ b/net/sched/sch_qfq.c
> >> @@ -522,7 +522,6 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
> >>       return 0;
> >>
> >>  destroy_class:
> >> -     qdisc_destroy(cl->qdisc);
> >>       kfree(cl);
> >>       return err;
> >>  }
> >
> >
> > Really ? I am calling this a leak of cl->qdisc.
> >
> >
> 
> How? I already added a comment on qdisc_create_dflt(), callers don't
> need to clean up
> on failure path.

Seriously, can you read the function again ?

What happens if gen_new_estimator() fails ?



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