linux-kernel - Re: [PATCH] net: sched: sch_taprio: fix memleak in error path for sched list parse

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Message-Id: <20190806.114114.1672670570404825284.davem@davemloft.net>
Date:   Tue, 06 Aug 2019 11:41:14 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ivan.khoronzhuk@...aro.org
Cc:     vinicius.gomes@...el.com, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sched: sch_taprio: fix memleak in error path for
 sched list parse

From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Date: Tue,  6 Aug 2019 13:04:25 +0300

> Based on net/master

I wonder about that because:

> --- a/net/sched/sch_taprio.c
> +++ b/net/sched/sch_taprio.c
> @@ -1451,7 +1451,8 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
>  	spin_unlock_bh(qdisc_lock(sch));
>  
>  free_sched:
> -	kfree(new_admin);
> +	if (new_admin)
> +		call_rcu(&new_admin->rcu, taprio_free_sched_cb);
>  
>  	return err;

In my tree the context around line 1451 is:

	nla_nest_end(skb, sched_nest);

done:
	rcu_read_unlock();

	return nla_nest_end(skb, nest);


which is part of function taprio_dump().

Please respin this properly against current 'net' sources.