netdev - Re: [BUG] [ROSE] slab-use-after-free in lock_timer

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Message-ID: <5adc15fe-8a65-4954-8719-76ed6a132b45@free.fr>
Date: Wed, 3 Sep 2025 12:11:39 +0200
From: F6BVP <f6bvp@...e.fr>
To: Eric Dumazet <edumazet@...gle.com>,
 Bernard Pidoux <bernard.pidoux@...e.fr>,
 Takamitsu Iwai <takamitz@...zon.co.jp>
Cc: linux-hams@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [BUG] [ROSE] slab-use-after-free in lock_timer_base

I am confused for not having CC Takamisu Iwai.

I apologize for this novice error.

Considering the syzreport report I just wanted to add my contribution to 
provide a way to easily reproduce the bug when performing rose network.


Le 03/09/2025 à 12:01, Eric Dumazet a écrit :
> On Wed, Sep 3, 2025 at 2:51 AM Bernard Pidoux <bernard.pidoux@...e.fr> wrote:
>>
>> On 6.16.4 kernel patched with last ROSE commit for refcount use
>> rose_remove_node() is causing refcount_t: underflow; use-after-free
>>
>> List:       linux-stable-commits
>> Subject:    Patch "net: rose: split remove and free operations in
>> rose_remove_neigh()" has been added to the 6.1
>> From:       Sasha Levin <sashal () kernel ! org>
>> Date:       2025-08-30 20:20:24
>> Message-ID: 20250830202024.2485006-1-sashal () kernel ! org
>>
>> Bernard Pidoux
>> F6BVP / AI7BG
> 
> Any particular reason you do not CC the author ?
> 
> CC Takamitsu Iwai <takamitz@...zon.co.jp>
> 
> BTW, a syzbot report was already sent to the list.
> 
> https://syzkaller.appspot.com/bug?extid=7287222a6d88bdb559a7
>