netdev - Re: [PATCH net v2] packet: avoid out of bounds read in round robin fanout

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Message-Id: <20150621.102715.802759820433121518.davem@davemloft.net>
Date:	Sun, 21 Jun 2015 10:27:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	willemb@...gle.com
Cc:	netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: [PATCH net v2] packet: avoid out of bounds read in round robin
 fanout

From: Willem de Bruijn <willemb@...gle.com>
Date: Wed, 17 Jun 2015 15:59:34 -0400

> From: Willem de Bruijn <willemb@...gle.com>
> 
> PACKET_FANOUT_LB computes f->rr_cur such that it is modulo
> f->num_members. It returns the old value unconditionally, but
> f->num_members may have changed since the last store. Ensure
> that the return value is always < num.
> 
> When modifying the logic, simplify it further by replacing the loop
> with an unconditional atomic increment.
> 
> Fixes: dc99f600698d ("packet: Add fanout support.")
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied and queued up for -stable, thanks.
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