netdev - Re: [PATCH net-next] mlx4: fix use-after-free in mlx4_en_fold_software

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Message-Id: <20161202.133623.2263271525505379413.davem@davemloft.net>
Date:   Fri, 02 Dec 2016 13:36:23 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     brouer@...hat.com, saeedm@....mellanox.co.il,
        netdev@...r.kernel.org, tariqt@...lanox.com
Subject: Re: [PATCH net-next] mlx4: fix use-after-free in
 mlx4_en_fold_software_stats()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 01 Dec 2016 05:02:06 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> My recent commit to get more precise rx/tx counters in ndo_get_stats64()
> can lead to crashes at device dismantle, as Jesper found out.
> 
> We must prevent mlx4_en_fold_software_stats() trying to access
> tx/rx rings if they are deleted.
> 
> Fix this by adding a test against priv->port_up in
> mlx4_en_fold_software_stats()
> 
> Calling mlx4_en_fold_software_stats() from mlx4_en_stop_port()
> allows us to eventually broadcast the latest/current counters to
> rtnetlink monitors.
> 
> Fixes: 40931b85113d ("mlx4: give precise rx/tx bytes/packets counters")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-and-bisected-by: Jesper Dangaard Brouer <brouer@...hat.com>
> Tested-by: Jesper Dangaard Brouer <brouer@...hat.com>

Applied.