netdev - Re: [PATCH net] ppp: don't override sk->sk_state in pppoe_flush

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Date:	Mon, 05 Oct 2015 03:05:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	g.nault@...halink.fr
Cc:	netdev@...r.kernel.org, paulus@...ba.org, core@....lg.ua,
	nuclearcat@...learcat.com
Subject: Re: [PATCH net] ppp: don't override sk->sk_state in
 pppoe_flush_dev()

From: Guillaume Nault <g.nault@...halink.fr>
Date: Wed, 30 Sep 2015 11:45:33 +0200

> Since commit 2b018d57ff18 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release"),
> pppoe_release() calls dev_put(po->pppoe_dev) if sk is in the
> PPPOX_ZOMBIE state. But pppoe_flush_dev() can set sk->sk_state to
> PPPOX_ZOMBIE _and_ reset po->pppoe_dev to NULL. This leads to the
> following oops:
 ...
> pppoe_flush_dev() has no reason to override sk->sk_state with
> PPPOX_ZOMBIE. pppox_unbind_sock() already sets sk->sk_state to
> PPPOX_DEAD, which is the correct state given that sk is unbound and
> po->pppoe_dev is NULL.
> 
> Fixes: 2b018d57ff18 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release")
> Tested-by: Oleksii Berezhniak <core@....lg.ua>
> Signed-off-by: Guillaume Nault <g.nault@...halink.fr>

Applied and queued up for -stable, thanks.
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