netdev - Re: [PATCH net] vxlan: Fix GRO cells race condition between receive and link delete

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Message-Id: <20190308.112814.595862977917502151.davem@davemloft.net>
Date:   Fri, 08 Mar 2019 11:28:14 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     sbrivio@...hat.com
Cc:     jishi@...hat.com, sd@...asysnail.net, tom@...bertland.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] vxlan: Fix GRO cells race condition between
 receive and link delete

From: Stefano Brivio <sbrivio@...hat.com>
Date: Fri,  8 Mar 2019 16:40:57 +0100

> If we receive a packet while deleting a VXLAN device, there's a chance
> vxlan_rcv() is called at the same time as vxlan_dellink(). This is fine,
> except that vxlan_dellink() should never ever touch stuff that's still in
> use, such as the GRO cells list.
> 
> Otherwise, vxlan_rcv() crashes while queueing packets via
> gro_cells_receive().
> 
> Move the gro_cells_destroy() to vxlan_uninit(), which runs after the RCU
> grace period is elapsed and nothing needs the gro_cells anymore.
> 
> This is now done in the same way as commit 8e816df87997 ("geneve: Use GRO
> cells infrastructure.") originally implemented for GENEVE.
> 
> Reported-by: Jianlin Shi <jishi@...hat.com>
> Fixes: 58ce31cca1ff ("vxlan: GRO support at tunnel layer")
> Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
> Reviewed-by: Sabrina Dubroca <sd@...asysnail.net>

Applied and queued up for -stable, thank you.