netdev - Re: Re: [BUG] KASAN: slab-use-after-free in slip

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Message-ID: <CANn89i+7_yf2U_bEin9iGAE1DifZ0F1=bRdnjZwq+_UNp3VB0w@mail.gmail.com>
Date: Thu, 6 Feb 2025 14:32:22 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Jiacheng Xu <stitch@....edu.cn>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, kuba@...nel.org, 
	pabeni@...hat.com, netdev@...r.kernel.org, wolffd@...p.nus.edu.sg
Subject: Re: Re: [BUG] KASAN: slab-use-after-free in slip_open

On Thu, Feb 6, 2025 at 2:22 PM Jiacheng Xu <stitch@....edu.cn> wrote:
>
> Hi Eric,
>
> We are a bit confused by your response. Could you please clarify whether you think this is simply a false positive report or if you are suggesting that the patch is ineffective?
>

Your patch is not correct, because we are not allowed to call
dev_close() under rcu_read_lock()

This might work for the particular repro and .config you were using,
but will trigger other syzbot reports quite fast.