linux-kernel - Re: [PATCH] xfrm_user: return error pointer instead of NULL

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Message-ID: <20120917071642.GC13023@secunet.com>
Date:	Mon, 17 Sep 2012 09:16:42 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Mathias Krause <minipli@...glemail.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] xfrm_user: return error pointer instead of NULL

On Thu, Sep 13, 2012 at 11:41:26PM +0200, Mathias Krause wrote:
> When dump_one_state() returns an error, e.g. because of a too small
> buffer to dump the whole xfrm state, xfrm_state_netlink() returns NULL
> instead of an error pointer. But its callers expect an error pointer
> and therefore continue to operate on a NULL skbuff.
> 
> This could lead to a privilege escalation (execution of user code in
> kernel context) if the attacker has CAP_NET_ADMIN and is able to map
> address 0.

Or it simply crashes with a NULL pointer dereference.

> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Mathias Krause <minipli@...glemail.com>

Acked-by: Steffen Klassert <steffen.klassert@...unet.com>
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