linux-kernel - Re: [PATCH v2] net: cgroup: fix access the unallocated memory in netprio cgroup

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Message-ID: <1341918530.3265.4839.camel@edumazet-glaptop>
Date:	Tue, 10 Jul 2012 13:08:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	nhorman@...driver.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, lizefan@...wei.com, tj@...nel.org,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2] net: cgroup: fix access the unallocated memory in
 netprio cgroup

On Tue, 2012-07-10 at 13:05 +0200, Eric Dumazet wrote:
> On Tue, 2012-07-10 at 18:44 +0800, Gao feng wrote:
> > there are some out of bound accesses in netprio cgroup.
> 
> > -	update_netdev_tables();
> > +	ret = extend_netdev_table(dev, max_len);
> > +	if (ret < 0)
> > +		goto out_free_devname;
> > +
> >  	ret = 0;
> >  	rcu_read_lock();
> >  	map = rcu_dereference(dev->priomap);
> 
> Its unfortunately adding a bug.
> 
> extend_netdev_table() is protected by RTNL.

Please test your next patch using :

CONFIG_LOCKDEP=y
CONFIG_PROVE_RCU=y

Because rtnl_dereference() should shout if you dont hold RTNL


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