netdev - Re: general protection fault in qdisc

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Message-ID: <CANn89iKkeM7s-ZbPR+d7P8PNZn_x3n15-e0Mvto7z-+5CWJSGA@mail.gmail.com>
Date: Mon, 19 Aug 2024 09:13:28 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: 김민성 <ii4gsp@...il.com>
Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, pabeni@...hat.com, 
	netdev@...r.kernel.org, kuba@...nel.org, jiri@...nulli.us, 
	linux-kernel@...r.kernel.org, davem@...emloft.net, syzkaller@...glegroups.com
Subject: Re: general protection fault in qdisc_reset

On Mon, Aug 19, 2024 at 9:11 AM 김민성 <ii4gsp@...il.com> wrote:
>
> Hi,
>
> I have been fuzzing Linux 6.10.0-rc3 with Syzkaller and found.
>
> kernel config: https://github.com/ii4gsp/etc/blob/main/200767fee68b8d90c9cf284390e34fa9b17542c9/config_v6.10.0_rc3
> C repro: https://github.com/ii4gsp/etc/blob/main/200767fee68b8d90c9cf284390e34fa9b17542c9/repro.cprog
> repro syscall steps:
> https://github.com/ii4gsp/etc/blob/main/200767fee68b8d90c9cf284390e34fa9b17542c9/repro.prog

Please do not fuzz old rc kernels, this will avoid finding issues that
were already fixed.

For instance, this problem has been fixed two months ago

commit bab4923132feb3e439ae45962979c5d9d5c7c1f1
Author: Yunseong Kim <yskelg@...il.com>
Date:   Tue Jun 25 02:33:23 2024 +0900

    tracing/net_sched: NULL pointer dereference in perf_trace_qdisc_reset()