linux-kernel - Re: [PATCH] workqueue: Fix UAF report by KASAN in pwq_release

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Message-ID: <ZPiwaaZaDPVexezn@slm.duckdns.org>
Date:   Wed, 6 Sep 2023 07:01:29 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Z qiang <qiang.zhang1211@...il.com>
Cc:     jiangshanlai@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: Fix UAF report by KASAN in
 pwq_release_workfn()

On Wed, Sep 06, 2023 at 10:12:34AM +0800, Z qiang wrote:
> Flush the pwq_release_worker is insufficient, the call_rcu() is
> invoked to release wq
> in pwq_release_workfn(), this is also asynchronous.

But rcu_free_pwq() doesn't access wq or anything. The last access is from
the work function.

Thanks.

-- 
tejun