linux-kernel - Re: [PATCH v5 6/6] mm: shrinkers: add scan interface for shrinker debugfs

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Date:   Thu, 2 Jun 2022 11:41:32 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Roman Gushchin <roman.gushchin@...ux.dev>
Cc:     linux-mm@...ck.org, Dave Chinner <dchinner@...hat.com>,
        linux-kernel@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>,
        Hillf Danton <hdanton@...a.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH v5 6/6] mm: shrinkers: add scan interface for shrinker
 debugfs

On Wed, 1 Jun 2022 17:56:22 -0700 Roman Gushchin <roman.gushchin@...ux.dev> wrote:

> > 
> > > +	ssize_t ret;
> > > +
> > > +	if (copy_from_user(kbuf, buf, read_len))
> > > +		return -EFAULT;
> > > +	kbuf[read_len] = '\0';
> > > +
> > > +	if (sscanf(kbuf, "%lu %d %lu", &ino, &nid, &nr_to_scan) < 2)
> > 
> > Was it intentional to permit more than three args?
> 
> Good catch! No, of course it wasn't intentional.
> 
> Below is an updated version of this patch.
> 
> ...
>
> +	if (sscanf(kbuf, "%lu %d %lu", &ino, &nid, &nr_to_scan) != 2)
> +		return -EINVAL;

s/2/3/methinks?