linux-kernel - Re: [PATCH] RDMA/hns: Fix UAF for cq async event

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Message-ID: <Zu1xS4dX77jikYw9@ziepe.ca>
Date: Fri, 20 Sep 2024 09:57:47 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: haixiao.yan.cn@...driver.com
Cc: liangwenpeng@...wei.com, liweihang@...wei.com, dledford@...hat.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/hns: Fix UAF for cq async event

On Fri, Sep 20, 2024 at 08:45:40PM +0800, haixiao.yan.cn@...driver.com wrote:
> From: Chengchang Tang <tangchengchang@...wei.com>
> 
> [ Upstream commit a942ec2745ca864cd8512142100e4027dc306a42 ]
> 
> The refcount of CQ is not protected by locks. When CQ asynchronous
> events and CQ destruction are concurrent, CQ may have been released,
> which will cause UAF.
> 
> Use the xa_lock() to protect the CQ refcount.
> 
> Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
> Signed-off-by: Chengchang Tang <tangchengchang@...wei.com>
> Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
> Link: https://lore.kernel.org/r/20240412091616.370789-6-huangjunxian6@hisilicon.com
> Signed-off-by: Leon Romanovsky <leon@...nel.org>
> Signed-off-by: Haixiao Yan <haixiao.yan.cn@...driver.com>
> ---
> This commit is backporting a942ec2745ca to the branch linux-5.15.y to
> solve the CVE-2024-38545. Please merge this commit to linux-5.15.y.

Don't you need to send this to the stable maintainers too?

Jason