linux-kernel - Re: [PATCH V2] binder: ipc namespace support for android binder

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Date:   Wed, 7 Nov 2018 14:37:44 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     chouryzhou (周威) 
        <chouryzhou@...cent.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "arve@...roid.com" <arve@...roid.com>,
        "tkjos@...roid.com" <tkjos@...roid.com>,
        "dave@...olabs.net" <dave@...olabs.net>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] binder: ipc namespace support for android binder

On Wed, 7 Nov 2018 01:48:12 +0000 chouryzhou(周威) <chouryzhou@...cent.com> wrote:

> > > --- a/ipc/namespace.c
> > > +++ b/ipc/namespace.c
> > > @@ -56,6 +56,9 @@ static struct ipc_namespace *create_ipc_ns(struct
> > user_namespace *user_ns,
> > >         ns->ucounts = ucounts;
> > >
> > >         err = mq_init_ns(ns);
> > > +       if (err)
> > > +               goto fail_put;
> > > +       err = binder_init_ns(ns);
> > >         if (err)
> > >                 goto fail_put;
> > >
> > 
> > Don't we need an mq_put_mnt() if binder_init_ns() fails?
> > 
> > free_ipc_ns() seems to have forgotten about that too.  In which case it
> > must be madly leaking mounts so probably I'm wrong.  Confused.
> > 
> 
> mq_init_ns will do clean job if it failed, and as do binder_init_ns. 

My point is that if mq_init_ns() succeeds and binder_init_ns() fails,
we don't undo the effects of mq_init_ns()?