netdev - Re: [PATCH ipsec] xfrm: Fix NULL pointer dereference on policy lookup

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Message-ID: <20210325084515.GW62598@gauss3.secunet.de>
Date:   Thu, 25 Mar 2021 09:45:15 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     <netdev@...r.kernel.org>
Subject: Re: [PATCH ipsec] xfrm: Fix NULL pointer dereference on policy lookup

On Tue, Mar 23, 2021 at 09:26:44AM +0100, Steffen Klassert wrote:
> When xfrm interfaces are used in combination with namespaces
> and ESP offload, we get a dst_entry NULL pointer dereference.
> This is because we don't have a dst_entry attached in the ESP
> offloading case and we need to do a policy lookup before the
> namespace transition.
> 
> Fix this by expicit checking of skb_dst(skb) before accessing it.
> 
> Fixes: f203b76d78092 ("xfrm: Add virtual xfrm interfaces")
> Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>

Now applied.