netdev - Re: [PATCH 2/2] mac80211_hwsim: Allow managing radios from non-initial namespaces

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Date:	Mon, 09 May 2016 09:31:30 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	David Laight <David.Laight@...LAB.COM>,
	'Martin Willi' <martin@...ongswan.org>
Cc:	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] mac80211_hwsim: Allow managing radios from
 non-initial namespaces


> > 
> > +	data->netgroup = *(int *)net_generic(net, hwsim_net_id);
> Anything doing *(integer_type *) rings alarm bells.
> 
> I suspect you should be defining a structure that currently contains
> one integer member.
> Something (maybe a compile time assert) needs to check that buffer
> space you are accessing (where ever it is) is large enough.
> 

It does look a bit awkward, but there's no value in having a struct -
you still have an opaque pointer here and cast it to something whose
size you assume to be present... it really makes no difference.

johannes