From: patchwork-bot+netdevbpf@kernel.org
To: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: netdev@vger.kernel.org, vinicius.gomes@intel.com,
jiri@resnulli.us, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, horms@kernel.org,
victor@mojatatu.com, pctammela@mojatatu.com,
graypanda.inzag@gmail.com
Subject: Re: [PATCH net v2 1/2] net/sched: sch_cbs: Call qdisc_reset for child qdisc
Date: Thu, 14 May 2026 01:00:06 +0000 [thread overview]
Message-ID: <177872040656.3902227.15382281185669127478.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260511183058.422998-1-jhs@mojatatu.com>
Hello:
This series was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Mon, 11 May 2026 14:30:57 -0400 you wrote:
> During a reset, CBS is not calling reset on its child qdisc, which
> might cause qlen/backlog accounting issues. For example, if we have CBS
> with a QFQ parent and a netem child with delay, we can create a scenario
> where the parent's qlen underflows. QFQ, specifically, uses qlen to
> check whether it should deference a pointer, so this scenario may cause
> a null-ptr deref in QFQ:
>
> [...]
Here is the summary with links:
- [net,v2,1/2] net/sched: sch_cbs: Call qdisc_reset for child qdisc
https://git.kernel.org/netdev/net/c/320fb29ea23c
- [net,v2,2/2] selftests/tc-testing: Add QFQ/CBS qlen underflow test
https://git.kernel.org/netdev/net/c/59afae20080a
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
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prev parent reply other threads:[~2026-05-14 1:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-11 18:30 [PATCH net v2 1/2] net/sched: sch_cbs: Call qdisc_reset for child qdisc Jamal Hadi Salim
2026-05-11 18:30 ` [PATCH net v2 2/2] selftests/tc-testing: Add QFQ/CBS qlen underflow test Jamal Hadi Salim
2026-05-14 1:00 ` patchwork-bot+netdevbpf [this message]
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