netdev - Re: [PATCH net-next] net-tun: fix panics at dismantle time

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Date:   Fri, 20 Oct 2017 13:31:58 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, peterpenkov96@...il.com, maheshb@...gle.com
Subject: Re: [PATCH net-next] net-tun: fix panics at dismantle time

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 18 Oct 2017 12:12:09 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> syzkaller got crashes at dismantle time [1]
> 
> It is not correct to test (tun->flags & IFF_NAPI) in tun_napi_disable()
> and tun_napi_del() : Each tun_file can have different mode, depending
> on how they were created.
> 
> Similarly I have changed tun_get_user() and tun_poll_controller()
> to use the new tfile->napi_enabled boolean.
 ...
> Fixes: 943170998b20 ("net-tun: enable NAPI for TUN/TAP driver")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.