linux-kernel - Re: [PATCH 0/1] devpts: use dynamic

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Message-ID: <87ziazqdfr.fsf@xmission.com>
Date:   Wed, 16 Aug 2017 18:51:20 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Christian Brauner <christian.brauner@...onical.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 0/1] devpts: use dynamic_dname() to generate proc name

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> On Wed, Aug 16, 2017 at 3:46 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
>>>       tty->link->driver_data = pts_path;
>>>
>>>       retval = ptm_driver->ops->open(tty, filp);
>>         ^^^^^^^
>>
>> If this open fails the code jumps to err_put_path which falls
>> through into out_put_fsi.
>
> No it doesn't.
>
> err_path_put falls through to err_release, but that then does a
> "return retval;". It doesn't get to out_put_fsi.

*Blink* You are right I missed that.

In which case I am concerned about failures that make it to err_release.
Unless I am missing something (again) failures that jump to err_release
won't call mntput and will result in a mnt leak.

> Now, I _do_ want people to check the release path, but I don't think
> this was it.  Or am I blind and missing something?

Eric