netdev - Re: [PATCH net v2] net: atm: Fix use-after-free bug in atm_dev

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Message-ID: <20221214084358.161f9d6f@kernel.org>
Date:   Wed, 14 Dec 2022 08:43:58 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Nir Levy <bhr166@...il.com>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com,
        linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH net v2] net: atm: Fix use-after-free bug in
 atm_dev_register()

On Wed, 14 Dec 2022 09:51:09 +0200 Leon Romanovsky wrote:
> > Also atm_dev_register() still frees the dev on atm_register_sysfs()
> > failure, is that okay?  
> 
> Yes, the kernel panic points that class_dev (not dev) had use-after-free.

How is that possible? "class_dev" is embedded in dev (struct atm_dev).