netdev - Re: [PATCH net] sch_netem: acquire qdisc lock in netem

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Date: Thu, 22 Jun 2023 09:20:20 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org, eric.dumazet@...il.com, syzkaller@...glegroups.com,
 stephen@...workplumber.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
 jiri@...nulli.us
Subject: Re: [PATCH net] sch_netem: acquire qdisc lock in netem_change()

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Tue, 20 Jun 2023 18:44:25 +0000 you wrote:
> syzbot managed to trigger a divide error [1] in netem.
> 
> It could happen if q->rate changes while netem_enqueue()
> is running, since q->rate is read twice.
> 
> It turns out netem_change() always lacked proper synchronization.
> 
> [...]

Here is the summary with links:
  - [net] sch_netem: acquire qdisc lock in netem_change()
    https://git.kernel.org/netdev/net/c/2174a08db80d

You are awesome, thank you!
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