linux-kernel - Re: [RFC v2 2/5] blktrace: fix debugfs use after free

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Message-ID: <20200414033244.GN11244@42.do-not-panic.com>
Date:   Tue, 14 Apr 2020 03:32:44 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     axboe@...nel.dk, viro@...iv.linux.org.uk,
        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: [RFC v2 2/5] blktrace: fix debugfs use after free

On Sat, Apr 11, 2020 at 04:09:13PM -0700, Bart Van Assche wrote:
> On 2020-04-10 12:58, Luis Chamberlain wrote:
> > On Thu, Apr 09, 2020 at 07:52:59PM -0700, Bart Van Assche wrote:
> >> On 2020-04-09 14:45, Luis Chamberlain wrote:
> >>> +void blk_q_debugfs_register(struct request_queue *q)
> >>> +{
> >>> +	q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
> >>> +					    blk_debugfs_root);
> >>> +}
> >>> +
> >>> +void blk_q_debugfs_unregister(struct request_queue *q)
> >>> +{
> >>> +	debugfs_remove_recursive(q->debugfs_dir);
> >>> +	q->debugfs_dir = NULL;
> >>> +}
> >>
> >> There are no other functions in the block layer that start with the
> >> prefix blk_q_. How about changing that prefix into blk_?
> > 
> > I the first patch already introduced blk_debugfs_register(), so I have
> > now changed the above to:
> > 
> > blk_debugfs_common_register()
> > blk_debugfs_common_unregister()
> > 
> > Let me know if something else is preferred.
> 
> I just realized that the "q" in "blk_q_" probably refers to the word
> "queue"? How about renaming these funtions into
> blk_queue_debugfs_register/unregister()?

Sure.

  Luis