linux-kernel - Re: [PATCH 2/2] net: Implement SO

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Message-ID: <20140313134840.GA18914@redhat.com>
Date:	Thu, 13 Mar 2014 09:48:40 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Cong Wang <cwang@...pensource.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	cgroups@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>, tj@...nel.org,
	ssorce@...hat.com, jkaluza@...hat.com, lpoetter@...hat.com,
	kay@...hat.com
Subject: Re: [PATCH 2/2] net: Implement SO_PEERCGROUP

On Wed, Mar 12, 2014 at 01:58:57PM -0700, Cong Wang wrote:
> On Wed, Mar 12, 2014 at 1:46 PM, Vivek Goyal <vgoyal@...hat.com> wrote:
> > @@ -1098,6 +1135,16 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
> >         if (newsk == NULL)
> >                 goto out;
> >
> > +       err = init_peercgroup(newsk);
> > +       if (err)
> > +               goto out;
> > +
> > +       err = alloc_cgroup_path(sk);
> > +       if (err)
> > +               goto out;
> > +
> > +       err = -ENOMEM;
> > +
> 
> Don't we need to free the cgroup_path on error path
> in this function?

Previous allocated cgroup_path is now in newsk->cgroup_path and I was
relying on __sk_free() freeing that memory if error happens.

unix_release_sock(sk)
  sock_put()
    sk_free()
      __sk_free()
        kfree(sk->cgroup_path)

Do you see a problem with that?

Thanks
Vivek
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