netdev - Re: [PATCH] net: net_assign

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Date:	Tue, 28 Jul 2009 15:22:09 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
CC:	Igor M Podlesny <for.poige+bugzilla.kernel.org@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] net: net_assign_generic()  fix

Eric Dumazet a écrit :
> Pavel Emelyanov a écrit :
>>> Hmm...
>>>
>>> Real bug may be fixed by followed patch ? (yet untested, sorry...)
>>>
>>> [PATCH] net: net_assign_generic() fix 
>>>
>>> memcpy() should take into account size of pointers,
>>> not only number of pointers to copy.
>>>
>>> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>> Acked-by: Pavel Emelyanov <xemul@...nvz.org>
> 
> Thanks.
> 
> Still this doesnt explain the crash, because initial number of pointers is 13
> (INITIAL_NET_GEN_PTRS)
> 
> We probably never realloc this array, unless a module forgets to
> unregister_pernet_gen_device() and we load/unload it many times ?
> 

Seems drivers/net/pppol2tp.c is a suspect...

It uses register_pernet_gen_device() from pppol2tp_init()
but doesnt call unregister_pernet_gen_device()
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