netdev - Re: [patch net] team: avoid possible underflow of count_pending value for notify_peers and mcast

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Date:	Thu, 15 Jan 2015 08:42:50 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, jbenc@...hat.com
Subject: Re: [patch net] team: avoid possible underflow of count_pending
 value for notify_peers and mcast_rejoin

Wed, Jan 14, 2015 at 10:55:09PM CET, davem@...emloft.net wrote:
>From: Jiri Pirko <jiri@...nulli.us>
>Date: Wed, 14 Jan 2015 18:15:30 +0100
>
>> This patch is fixing a race condition that may cause setting
>> count_pending to -1, which results in unwanted big bulk of arp messages
>> (in case of "notify peers").
>> 
>> Consider following scenario:
> ...
>> Fix this race by using atomic_dec_if_positive - that will prevent
>> count_pending running under 0.
>> 
>> Fixes: fc423ff00df3a1955441 ("team: add peer notification")
>> Fixes: 492b200efdd20b8fcfd  ("team: add support for sending multicast rejoins")
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> Signed-off-by: Jiri Benc <jbenc@...hat.com>
>
>Applied, thanks.
>
>I am assuming that v3.12 and later need this fix, therefore I'm queueing it up for
>-stable.

Yes, thanks!
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