linux-kernel - Re: [PATCH] mrp: introduce active flags to prevent UAF when applicant uninit

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Date:   Fri, 18 Nov 2022 12:40:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Schspa Shi <schspa@...il.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, Jason@...c4.com, djwong@...nel.org,
        jack@...e.cz, hca@...ux.ibm.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+6fd64001c20aa99e34a4@...kaller.appspotmail.com
Subject: Re: [PATCH] mrp: introduce active flags to prevent UAF when applicant
 uninit

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@...emloft.net>:

On Wed, 16 Nov 2022 19:45:11 +0800 you wrote:
> The caller of del_timer_sync must prevent restarting of the timer, If
> we have no this synchronization, there is a small probability that the
> cancellation will not be successful.
> 
> And syzbot report the fellowing crash:
> ==================================================================
> BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline]
> BUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605
> Write at addr f9ff000024df6058 by task syz-fuzzer/2256
> Pointer tag: [f9], memory tag: [fe]
> 
> [...]

Here is the summary with links:
  - mrp: introduce active flags to prevent UAF when applicant uninit
    https://git.kernel.org/netdev/net-next/c/ab0377803daf

You are awesome, thank you!
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