linux-kernel - Re: [PATCH 2/2] l2tp: fix possible use-after-free

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Date:   Mon, 06 Jun 2022 10:10:01 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Xiaohui Zhang <ruc_zhangxiaohui@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.or,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] l2tp: fix possible use-after-free

Hello,

On Sun, 2022-06-05 at 19:54 +0800, Xiaohui Zhang wrote:
> From: xiaohuizhang98 <ruc_zhangxiaohui@....com>
> 
> We detected a suspected bug with our code clone detection tool.
> 
> Similar to the handling of l2tp_tunnel_get in commit a622b40035d1
> ("l2ip: fix possible use-after-free"), we thought a patch might
> be needed here as well.
> 
> Before taking a refcount on a rcu protected structure,
> we need to make sure the refcount is not zero.
> 
> Signed-off-by: xiaohuizhang98 <ruc_zhangxiaohui@....com>

It looks like series this did not make to patchwork, due to a typo in
the ML address, please fix it and resend: netdev@...r.kernel.or ->
netdev@...r.kernel.org

Thanks,

Paolo