linux-kernel - Re: [PATCH] netvsc: don't access netdev->num_rx

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]

Date:   Wed, 21 Jun 2017 16:19:05 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Stephen Hemminger <sthemmin@...rosoft.com>, netdev@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] netvsc: don't access netdev->num_rx_queues directly

On Thu, 22 Jun 2017 00:16:37 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> This structure member is hidden behind CONFIG_SYSFS, and we
> get a build error when that is disabled:
> 
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_channels':
> drivers/net/hyperv/netvsc_drv.c:754:49: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> drivers/net/hyperv/netvsc_drv.c: In function 'netvsc_set_rxfh':
> drivers/net/hyperv/netvsc_drv.c:1181:25: error: 'struct net_device' has no member named 'num_rx_queues'; did you mean 'num_tx_queues'?
> 
> As the value is only set once to the argument of alloc_netdev_mq(),
> we can compare against that constant directly.
> 
> Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
> Fixes: 2b01888d1b45 ("netvsc: allow more flexible setting of number of channels")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Yes this makes sense. The checks when changing values with ethtool are to avoid
to large a value > 64.

Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>