netdev - Re: [PATCH] net: net_assign

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Message-ID: <4A6EF705.6070403@openvz.org>
Date:	Tue, 28 Jul 2009 17:03:01 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Igor M Podlesny <for.poige+bugzilla.kernel.org@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.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

> 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>

> ---
> diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
> index b7292a2..1972830 100644
> --- a/net/core/net_namespace.c
> +++ b/net/core/net_namespace.c
> @@ -488,7 +488,7 @@ int net_assign_generic(struct net *net, int id, void *data)
>  	 */
>  
>  	ng->len = id;
> -	memcpy(&ng->ptr, &old_ng->ptr, old_ng->len);
> +	memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*));
>  
>  	rcu_assign_pointer(net->gen, ng);
>  	call_rcu(&old_ng->rcu, net_generic_release);
> 
> 

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