netdev - Re: [PATCH v2 2/2] drop_monitor: Make updating data->skb smp safe

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Date:	Sat, 28 Apr 2012 08:13:35 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH v2 2/2] drop_monitor: Make updating data->skb smp safe

On Fri, 2012-04-27 at 16:11 -0400, Neil Horman wrote:
> Eric Dumazet pointed out to me that the drop_monitor protocol has some holes in
> its smp protections.  Specifically, its possible to replace data->skb while its
> being written.  This patch corrects that by making data->skb and rcu protected
> variable.  That will prevent it from being overwritten while a tracepoint is
> modifying it.
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> Reported-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: David Miller <davem@...emloft.net>
> ---
>  net/core/drop_monitor.c |   70 ++++++++++++++++++++++++++++++++++++-----------
>  1 files changed, 54 insertions(+), 16 deletions(-)

Acked-by: Eric Dumazet <edumazet@...gle.com>

Thanks Neil


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