linux-kernel - Re: [PATCH v2] xfrm: add NULL check in xfrm_update_ae

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Message-ID: <ZMjXfOIpOXcRF5Sn@gauss3.secunet.de>
Date:   Tue, 1 Aug 2023 11:59:24 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Lin Ma <linma@....edu.cn>
CC:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] xfrm: add NULL check in xfrm_update_ae_params

On Fri, Jul 21, 2023 at 10:51:03PM +0800, Lin Ma wrote:
> Normally, x->replay_esn and x->preplay_esn should be allocated at
> xfrm_alloc_replay_state_esn(...) in xfrm_state_construct(...), hence the
> xfrm_update_ae_params(...) is okay to update them. However, the current
> implementation of xfrm_new_ae(...) allows a malicious user to directly
> dereference a NULL pointer and crash the kernel like below.

...

> This Null-ptr-deref bug is assigned CVE-2023-3772. And this commit
> adds additional NULL check in xfrm_update_ae_params to fix the NPD.
> 
> Fixes: d8647b79c3b7 ("xfrm: Add user interface for esn and big anti-replay windows")
> Signed-off-by: Lin Ma <linma@....edu.cn>

Applied, thanks a lot!