netdev - Re: [PATCH] driver: net: can: delete napi if register

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20211017201629.xb3d6ux5r2r6bfgj@pengutronix.de>
Date:   Sun, 17 Oct 2021 22:16:29 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        linux-can@...r.kernel.org,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver: net: can: delete napi if register_candev fails

On 17.10.2021 20:52:14, Dongliang Mu wrote:
> On Sun, Oct 17, 2021 at 8:36 PM Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> >
> > On 13.10.2021 13:21:09, Dongliang Mu wrote:
> > > On Wed, Oct 13, 2021 at 12:04 PM Dongliang Mu <mudongliangabcd@...il.com> wrote:
> > > >
> > > > If register_candev fails, xcan_probe does not clean the napi
> > > > created by netif_napi_add.
> > > >
> > >
> > > It seems the netif_napi_del operation is done in the free_candev
> > > (free_netdev precisely).
> > >
> > > list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
> > >           netif_napi_del(p);
> > >
> > > And list_add_rcu(&napi->dev_list, &dev->napi_list) is done in the
> > > netif_napi_add.
> > >
> > > Therefore, I suggest removing "netif_napi_del" operation in the
> > > xcan_remove to match probe and remove function.
> >
> > Sounds reasonable, can you create a patch for this.
> 
> I have submitted one patch - https://lkml.org/lkml/2021/10/17/181

Thanks for the patch.

Regards,
Marc

BTW: Do you know the new kernel.org mailing list archive available at
https://lore.kernel.org ?
You can reference a mail using its Message-ID, in you case it's:
https://lore.kernel.org/all/20211017125022.3100329-1-mudongliangabcd@gmail.com

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)