netdev - Re: [PATCH] net/sched: Always pass notifications when child class becomes empty

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Message-Id: 
 <175149301450.875317.4500699769123962307.git-patchwork-notify@kernel.org>
Date: Wed, 02 Jul 2025 21:50:14 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Lion Ackermann <nnamrec@...il.com>
Cc: netdev@...r.kernel.org, jiri@...nulli.us, xiyou.wangcong@...il.com,
 jhs@...atatu.com, victor@...atatu.com, mincho@...ori.io
Subject: Re: [PATCH] net/sched: Always pass notifications when child class
 becomes
 empty

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Mon, 30 Jun 2025 15:27:30 +0200 you wrote:
> Certain classful qdiscs may invoke their classes' dequeue handler on an
> enqueue operation. This may unexpectedly empty the child qdisc and thus
> make an in-flight class passive via qlen_notify(). Most qdiscs do not
> expect such behaviour at this point in time and may re-activate the
> class eventually anyways which will lead to a use-after-free.
> 
> The referenced fix commit attempted to fix this behavior for the HFSC
> case by moving the backlog accounting around, though this turned out to
> be incomplete since the parent's parent may run into the issue too.
> The following reproducer demonstrates this use-after-free:
> 
> [...]

Here is the summary with links:
  - net/sched: Always pass notifications when child class becomes empty
    https://git.kernel.org/netdev/net/c/103406b38c60

You are awesome, thank you!
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