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Message-ID: <20240913113727.GX572255@kernel.org>
Date: Fri, 13 Sep 2024 12:37:27 +0100
From: Simon Horman <horms@...nel.org>
To: Kaixin Wang <kxwang23@...udan.edu.cn>
Cc: davem@...emloft.net, wtdeng24@...udan.edu.cn,
21210240012@...udan.edu.cn, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, edumazet@...gle.com, kuba@...nel.org
Subject: Re: [PATCH] net: seeq: Fix use after free vulnerability in ether3
Driver Due to Race Condition
On Tue, Sep 10, 2024 at 01:58:21AM +0800, Kaixin Wang wrote:
> In the ether3_probe function, a timer is initialized with a callback
> function ether3_ledoff, bound to &prev(dev)->timer. Once the timer is
> started, there is a risk of a race condition if the module or device
> is removed, triggering the ether3_remove function to perform cleanup.
> The sequence of operations that may lead to a UAF bug is as follows:
>
> CPU0 CPU1
>
> | ether3_ledoff
> ether3_remove |
> free_netdev(dev); |
> put_devic |
> kfree(dev); |
> | ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
> | // use dev
>
> Fix it by ensuring that the timer is canceled before proceeding with
> the cleanup in ether3_remove.
>
> Signed-off-by: Kaixin Wang <kxwang23@...udan.edu.cn>
This seems like it is a bug fix to me. If so, it should have a Fixes tag
(immediately above your Signed-off-by line, no blank line in between). And
be targeted at net.
Subject: [PATCH net] ...
Unless the bug only exists in net-next.
Subject: [PATCH net-next] ...
Link: https://docs.kernel.org/process/maintainer-netdev.html
...
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