linux-kernel - Re: [PATCH v4] net: ravb: Fix possible UAF bug in ravb

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Message-ID: <20230815100844.GA495519@google.com>
Date:   Tue, 15 Aug 2023 11:08:44 +0100
From:   Lee Jones <lee@...nel.org>
To:     Zheng Wang <zyytlz.wz@....com>
Cc:     s.shtylyov@....ru, linyunsheng@...wei.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        richardcochran@...il.com, p.zabel@...gutronix.de,
        geert+renesas@...der.be, magnus.damm@...il.com,
        yoshihiro.shimoda.uh@...esas.com, biju.das.jz@...renesas.com,
        wsa+renesas@...g-engineering.com, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        hackerzheng666@...il.com, 1395428693sheep@...il.com,
        alex000young@...il.com
Subject: Re: [PATCH v4] net: ravb: Fix possible UAF bug in ravb_remove

On Tue, 25 Jul 2023, Zheng Wang wrote:

> In ravb_probe, priv->work was bound with ravb_tx_timeout_work.
> If timeout occurs, it will start the work. And if we call
> ravb_remove without finishing the work, there may be a
> use-after-free bug on ndev.
> 
> Fix it by finishing the job before cleanup in ravb_remove.
> 
> Note that this bug is found by static analysis, it might be
> false positive.
> 
> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
> Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
> ---
> v4:
> - add information about the bug was found suggested by Yunsheng Lin
> v3:
> - fix typo in commit message
> v2:
> - stop dev_watchdog so that handle no more timeout work suggested by Yunsheng Lin,
> add an empty line to make code clear suggested by Sergey Shtylyov
> ---
>  drivers/net/ethernet/renesas/ravb_main.c | 3 +++
>  1 file changed, 3 insertions(+)

Trying my best not to sound like a broken record, but ...

What's the latest with this fix?  Is a v5 en route?

-- 
Lee Jones [李琼斯]