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

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Date:   Wed, 16 Aug 2017 17:08:07 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
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

On Wed, Aug 16, 2017 at 4:51 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> *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.

Yes, I think you're right.

Maybe this attached patch is better anyway. It's smaller, because it
keeps more closely to the old code, and just adds a mntput() in all
the exit cases, and depends on the "path_get()" to have incremented
the mnt refcount one extra time.

Can you find something in this one?

ENTIRELY UNTESTED!

               Linus

View attachment "patch.diff" of type "text/plain" (2883 bytes)