netdev - Re: [PATCH net-next] 802: fix a possible race condition

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Message-Id: <20130407.170433.1137459032889983595.davem@davemloft.net>
Date:	Sun, 07 Apr 2013 17:04:33 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	amwang@...hat.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com,
	david.ward@...mit.edu, jorge@...2.net
Subject: Re: [PATCH net-next] 802: fix a possible race condition

From: Cong Wang <amwang@...hat.com>
Date: Wed,  3 Apr 2013 15:52:40 +0800

> From: Cong Wang <amwang@...hat.com>
> 
> (Resend with a better changelog)
> 
> garp_pdu_queue() should ways be called with this spin lock.
> garp_uninit_applicant() only holds rtnl lock which is not
> enough here.  A possible race can happen as garp_pdu_rcv()
> is called in BH context:
> 
> 	garp_pdu_rcv()
> 	  |->garp_pdu_parse_msg()
> 	    |->garp_pdu_parse_attr()
> 	      |-> garp_gid_event()
> 
> Found by code inspection.
> 
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: David Ward <david.ward@...mit.edu>
> Cc: "Jorge Boncompte [DTI2]" <jorge@...2.net>
> Signed-off-by: Cong Wang <amwang@...hat.com>

Applied.
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