netdev - Re: [PATCH net-next 1/2] net: linkwatch: add check for netdevice being present to linkwatch_do

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

Message-ID: <6e4ae96c-f879-d545-6e66-0fc9b01ac56d@gmail.com>
Date:   Wed, 19 Sep 2018 17:03:02 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH net-next 1/2] net: linkwatch: add check for netdevice
 being present to linkwatch_do_dev

On 09/18/2018 12:55 PM, Heiner Kallweit wrote:
> When bringing down the netdevice (incl. detaching it) and calling
> netif_carrier_off directly or indirectly the latter triggers an
> asynchronous linkwatch event.
> This linkwatch event eventually may fail to access chip registers in
> the ndo_get_stats/ndo_get_stats64 callback because the device isn't
> accessible any longer, see call trace in [0].
> 
> To prevent this scenario don't check for IFF_UP only, but also make
> sure that the netdevice is present.
> 
> [0] https://lists.openwall.net/netdev/2018/03/15/62
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

Thanks Heiner!
-- 
Florian