linux-kernel - Re: [PATCH 1/2] tuntap: forbid calling TUNSETIFF when detached

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Message-ID: <50F0CAE9.2080303@redhat.com>
Date:	Sat, 12 Jan 2013 10:31:05 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Stefan Hajnoczi <stefanha@...hat.com>
CC:	davem@...emloft.net, mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tuntap: forbid calling TUNSETIFF when detached

On 01/11/2013 10:42 PM, Stefan Hajnoczi wrote:
> On Fri, Jan 11, 2013 at 04:50:41PM +0800, Jason Wang wrote:
>> @@ -1546,6 +1544,9 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
>>  	struct net_device *dev;
>>  	int err;
>>  
>> +	if (rcu_dereference_protected(tfile->detached, lockdep_rtnl_is_held()))
>> +		return -EINVAL;
>> +
> How come none of the other tfile->detached users call rcu_*()?

Right, no need to use rcu, the access were protected by rtnl lock.

Will repost.
> Stefan
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