netdev - Re: [PATCH net v8 1/2] net/sched: sch_cake: Fix incorrect qlen reduction in cake

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Message-Id: 
 <176467920730.3217664.13875625137012436727.git-patchwork-notify@kernel.org>
Date: Tue, 02 Dec 2025 12:40:07 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Xiang Mei <xmei5@....edu>
Cc: security@...nel.org, netdev@...r.kernel.org, toke@...e.dk,
 xiyou.wangcong@...il.com, cake@...ts.bufferbloat.net, bestswngs@...il.com
Subject: Re: [PATCH net v8 1/2] net/sched: sch_cake: Fix incorrect qlen
 reduction
 in cake_drop

Hello:

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

On Thu, 27 Nov 2025 17:14:14 -0700 you wrote:
> In cake_drop(), qdisc_tree_reduce_backlog() is used to update the qlen
> and backlog of the qdisc hierarchy. Its caller, cake_enqueue(), assumes
> that the parent qdisc will enqueue the current packet. However, this
> assumption breaks when cake_enqueue() returns NET_XMIT_CN: the parent
> qdisc stops enqueuing current packet, leaving the tree qlen/backlog
> accounting inconsistent. This mismatch can lead to a NULL dereference
> (e.g., when the parent Qdisc is qfq_qdisc).
> 
> [...]

Here is the summary with links:
  - [net,v8,1/2] net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop
    https://git.kernel.org/netdev/net/c/9fefc78f7f02
  - [net,v8,2/2] selftests/tc-testing: Test CAKE scheduler when enqueue drops packets
    https://git.kernel.org/netdev/net/c/108f9405ce81

You are awesome, thank you!
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