linux-kernel - Re: netlink: Add netlink_bound helper and use it in netlink

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Message-ID: <20150926195245.GF3572@htj.duckdns.org>
Date:	Sat, 26 Sep 2015 15:52:45 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, cwang@...pensource.com,
	tom@...bertland.com, kafai@...com, kernel-team@...com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	torvalds@...ux-foundation.org, jiri@...nulli.us,
	nicolas.dichtel@...nd.com, tgraf@...g.ch, sfeldma@...il.com
Subject: Re: netlink: Add netlink_bound helper and use it in netlink_getname

Hello,

On Sun, Sep 27, 2015 at 03:49:16AM +0800, Herbert Xu wrote:
> If the autobind is not complete then netlink_getname must return
> zero rather than some garbage portid that belongs to somebody
> else's socket.  That's what we did before any of this lockless
> code was introduced.
> 
> If you don't check nlk->bound then you may return garbage.

Ah, yeah, you're right.  We need to check that there because it may
contain a garbage value.  I still think it'd better to use
netlink_bound() test in connect() too tho.

Thanks.

-- 
tejun
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