netdev - Re: [PATCH net-next] net/sched: unregister lockdep keys in qdisc_create/qdisc

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Message-ID: <CANn89iJETs=YMAiR5vP5pB2ENdeZ_uSHM0JrW1Wkkz6Du234oQ@mail.gmail.com>
Date: Wed, 1 May 2024 09:39:51 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Davide Caratti <dcaratti@...hat.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>, 
	Jiri Pirko <jiri@...nulli.us>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Naresh Kamboju <naresh.kamboju@...aro.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net/sched: unregister lockdep keys in
 qdisc_create/qdisc_alloc error path

On Tue, Apr 30, 2024 at 7:11 PM Davide Caratti <dcaratti@...hat.com> wrote:
>
> Naresh and Eric report several errors (corrupted elements in the dynamic
> key hash list), when running tdc.py or syzbot. The error path of
> qdisc_alloc() and qdisc_create() frees the qdisc memory, but it forgets
> to unregister the lockdep key, thus causing use-after-free like the
> following one:
>
>  ==================================================================
>  BUG: KASAN: slab-use-after-free in lockdep_register_key+0x5f2/0x700
>  Read of size 8 at addr ffff88811236f2a8 by task ip/7925
>
>
> Fixes: af0cb3fa3f9e ("net/sched: fix false lockdep warning on qdisc root lock")
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Closes: https://lore.kernel.org/netdev/20240429221706.1492418-1-naresh.kamboju@linaro.org/
> CC: Naresh Kamboju <naresh.kamboju@...aro.org>
> CC: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>
> ---

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

I hope syzbot storm will be stopped with this fix.