netdev - Re: [PATCH 2/7] CAN: Add PF

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Message-ID: <ygfzlzfuccs.fsf@janus.isnogud.escape.de>
Date:	21 Sep 2007 20:01:23 +0200
From:	Urs Thuermann <urs@...ogud.escape.de>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oliver Hartkopp <oliver@...tkopp.net>,
	Oliver Hartkopp <oliver.hartkopp@...kswagen.de>
Subject: Re: [PATCH 2/7] CAN: Add PF_CAN core module

Patrick McHardy <kaber@...sh.net> writes:

> You drop the module reference again when leaving this function.
> So sock->ops might contain a stale pointer if the module is
> unloaded after this. You need to either keep the module reference
> while the socket is alive or remove stale references when
> unregistering the protocol.

I don't think that can happen.  Before we drop the module reference we
call sk_alloc() which gets another module reference via its cp->prot
argument.  If sk_alloc() fails we return with error from can_create()
I assume sock->ops won't be used after that.

urs
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