netdev - Re: [PATCH v2] mac802154: Fix potential RCU dereference issue in mac802154_scan

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Message-ID: <tencent_51492FE7A9204AE5B3DC49FA4F144D310F08@qq.com>
Date: Sat, 21 Sep 2024 05:22:48 +0000
From: Jiawei Ye <jiawei.ye@...mail.com>
To: miquel.raynal@...tlin.com
Cc: alex.aring@...il.com,
	davem@...emloft.net,
	david.girault@...vo.com,
	edumazet@...gle.com,
	jiawei.ye@...mail.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-wpan@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	przemyslaw.kitszel@...el.com,
	stefan@...enfreihafen.org
Subject: Re: [PATCH v2] mac802154: Fix potential RCU dereference issue in mac802154_scan_worker

Hi Miquèl,

I'm sorry for the accidental email sent while testing my email setup. Please disregard the previous message.

On 9/20/24 19:21, Miquel Raynal wrote:
> Hi Jiawei,
> 
> jiawei.ye@...mail.com wrote on Fri, 20 Sep 2024 04:03:32 +0000:
> 
> > In the `mac802154_scan_worker` function, the `scan_req->type` field was
> > accessed after the RCU read-side critical section was unlocked. According
> > to RCU usage rules, this is illegal and can lead to unpredictable
> > behavior, such as accessing memory that has been updated or causing
> > use-after-free issues.
> > 
> > This possible bug was identified using a static analysis tool developed
> > by myself, specifically designed to detect RCU-related issues.
> > 
> > To address this, the `scan_req->type` value is now stored in a local
> > variable `scan_req_type` while still within the RCU read-side critical
> > section. The `scan_req_type` is then used after the RCU lock is released,
> > ensuring that the type value is safely accessed without violating RCU
> > rules.
> > 
> > Fixes: e2c3e6f53a7a ("mac802154: Handle active scanning")
> > Signed-off-by: Jiawei Ye <jiawei.ye@...mail.com>
> 
> I think net maintainers now expect the Cc: stable tag to be put here
> when there is a reason to backport, which I believe is the case here.
> So please add this line here.
> 

Does this mean I should use Cc: stable@...r.kernel.org? I am not familiar with this procedure.

> > 
> 
> Please delete this blank line as well.
> 
> And with that you can add my:
> 
> Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>
> 
> > ---
> 
> Thanks,
> Miquèl

Do I need to resend patch v2 with the "Resend" label?

Thank you for your assistance.

Best regards,
Jiawei Ye