linux-kernel - Re: [PATCH v4 5/6] clone3: allow spawning processes into cgroups

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Date:   Mon, 20 Jan 2020 16:39:30 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>, cgroups@...r.kernel.org
Subject: Re: [PATCH v4 5/6] clone3: allow spawning processes into cgroups

On 01/17, Christian Brauner wrote:
>
> +static int cgroup_css_set_fork(struct task_struct *parent,
> +			       struct kernel_clone_args *kargs)
...
> +	kargs->cset = find_css_set(cset, dst_cgrp);
> +	if (!kargs->cset) {
> +		ret = -ENOMEM;
> +		goto err;
> +	}
> +
> +	if (cgroup_is_dead(dst_cgrp)) {
> +		ret = -ENODEV;
> +		goto err;
                ^^^^^^^^

this looks wrong... don't we need put_css_set(kargs->cset) before "goto err" ?

Oleg.