linux-kernel - Re: [PATCH] namei: get rid of unused filename

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Message-ID: <YS+csMTV2tTXKg3s@zeniv-ca.linux.org.uk>
Date:   Wed, 1 Sep 2021 15:30:56 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Dmitry Kadashev <dkadashev@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Stephen Brennan <stephen.s.brennan@...cle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] namei: get rid of unused filename_parentat()

On Wed, Sep 01, 2021 at 10:00:40PM +0700, Dmitry Kadashev wrote:
> After the switch of kern_path_locked() to __filename_parentat() (to
> address use after free bug) nothing is using filename_parentat(). Also,
> filename_parentat() is inherently buggy: the "last" output arg
> always point to freed memory.
> 
> Drop filename_parentat() and rename __filename_parentat() to
> filename_parentat().

I'd rather fold that into previous patch.

And it might be better to fold filename_create() into its 2 callers
and rename __filename_create() as well.

Let me poke around a bit...