From: Paul Clements <paul.clements@us.sios.com>
To: Markus Pargmann <mpa@pengutronix.de>
Cc: "nbd-general@lists.sourceforge.net"
<nbd-general@lists.sourceforge.net>,
kernel list <linux-kernel@vger.kernel.org>,
kernel@pengutronix.de
Subject: Re: [RFC 2/4] nbd: Split 'DO_IT' into three functions
Date: Mon, 26 Jan 2015 11:16:12 -0500 [thread overview]
Message-ID: <CAECXXi5GcAbBzS+ATr2BRryJPvAUPCTMkmVT2TKWESG6anWuWw@mail.gmail.com> (raw)
In-Reply-To: <1421156665-27318-3-git-send-email-mpa@pengutronix.de>
Markus,
This refactor looks OK with the exception of one thing...
On Tue, Jan 13, 2015 at 8:44 AM, Markus Pargmann <mpa@pengutronix.de> wrote:
> /* Must be called with tx_lock held */
>
> static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
> @@ -684,61 +773,8 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
> set_capacity(nbd->disk, nbd->bytesize >> 9);
> return 0;
>
> - case NBD_DO_IT: {
> - struct task_struct *thread;
> - struct socket *sock;
> - int error;
> -
> - if (nbd->pid)
> - return -EBUSY;
> - if (!nbd->sock)
> - return -EINVAL;
>
You seem to have done away with these checks. Was that inadvertent or
was there a reason for that? The pid check is necessary to prevent two
instances of NBD_DO_IT from running. Without the sock check you'll get
a null pointer deref in nbd_do_it.
Thanks,
Paul
next prev parent reply other threads:[~2015-01-26 16:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-13 13:44 [RFC 0/4] nbd: root device support Markus Pargmann
2015-01-13 13:44 ` [RFC 1/4] nbd: Replace kthread_create with kthread_run Markus Pargmann
2015-01-13 13:44 ` [RFC 2/4] nbd: Split 'DO_IT' into three functions Markus Pargmann
2015-01-26 16:16 ` Paul Clements [this message]
2015-01-26 16:23 ` Markus Pargmann
2015-01-13 13:44 ` [RFC 3/4] nbd: Create helper functions for ioctls Markus Pargmann
2015-01-28 21:04 ` Paul Clements
2015-01-30 7:54 ` Markus Pargmann
2015-01-13 13:44 ` [RFC 4/4] nbd: Add support for nbd as root device Markus Pargmann
2015-01-20 11:51 ` Markus Pargmann
2015-01-29 23:42 ` [Nbd] " Wouter Verhelst
2015-01-30 8:04 ` Markus Pargmann
2015-01-30 17:30 ` Wouter Verhelst
2015-01-31 12:38 ` Markus Pargmann
[not found] ` <CAECXXi5+VhBeZwZ5aosc+Oc+0bCZbJZTjzYA-QTRrJCjs2NFOw@mail.gmail.com>
2015-01-31 14:43 ` Andreas Klauer
2015-01-31 15:45 ` Markus Pargmann
2015-01-31 15:00 ` Markus Pargmann
2015-01-30 18:10 ` [Nbd] " H. Peter Anvin
2015-01-31 12:08 ` Markus Pargmann
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