linux-kernel - Re: [PATCH v3 4/6] blktrace: fix debugfs use after free

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Message-ID: <20200429120406.GA913@infradead.org>
Date:   Wed, 29 Apr 2020 05:04:06 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, bvanassche@....org,
        gregkh@...uxfoundation.org, rostedt@...dmis.org, mingo@...hat.com,
        jack@...e.cz, ming.lei@...hat.com, nstange@...e.de,
        akpm@...ux-foundation.org, mhocko@...e.com, yukuai3@...wei.com,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Omar Sandoval <osandov@...com>,
        Hannes Reinecke <hare@...e.com>,
        Michal Hocko <mhocko@...nel.org>,
        syzbot+603294af2d01acfdd6da@...kaller.appspotmail.com
Subject: Re: [PATCH v3 4/6] blktrace: fix debugfs use after free

On Wed, Apr 29, 2020 at 12:02:30PM +0000, Luis Chamberlain wrote:
> > Err, that function is static and has two callers.
> 
> Yes but that is to make it easier to look for who is creating the
> debugfs_dir for either the request_queue or partition. I'll export
> blk_debugfs_root and we'll open code all this.

No, please not.  exported variables are usually a bad idea.  Just
skip the somewhat pointless trivial static function.