Hello:
This series was applied to netdev/net.git (main)
by Paolo Abeni [off-list ref]:
On Sat, 22 Aug 2026 15:55:03 -0400 you wrote:
Several qdiscs derive their per-flow quantum or CoDel mtu from
psched_mtu() without an overflow or zero clamp, which can drive the
dequeue/credit-refill loop into a soft lockup or silently disable the
AQM. vega@nebusec.ai provided reports and PoCs for the following qdiscs:
sch_fq, sch_fq_codel, sch_fq_pie, sch_hhf, and sch_sfq.
sch_codel was found by inspection for the same pattern. It's TheLinuxWay
(i.e cutnpaste code from somewhere for your new feature) and the AIs
are having a lot of fun finding patterns. We must overcome!
[...]
Here is the summary with links:
- [net,v3,1/6] net/sched: fq: add overflow bounds to quantum and initial quantum
https://git.kernel.org/netdev/net/c/709f34f7c28d
- [net,v3,2/6] net/sched: fq_codel: clamp default quantum and mtu
https://git.kernel.org/netdev/net/c/d9ebd8f9aa8b
- [net,v3,3/6] net/sched: sch_codel: clamp default mtu to avoid disabling CoDel
https://git.kernel.org/netdev/net/c/6439461f1618
- [net,v3,4/6] net/sched: fq_pie: clamp default quantum to avoid signed overflow
https://git.kernel.org/netdev/net/c/c86cd7ed0b0e
- [net,v3,5/6] net/sched: hhf: clamp quantum before hhf_change() to avoid overflow
https://git.kernel.org/netdev/net/c/2164b512b97b
- [net,v3,6/6] net/sched: sfq: clamp quantum to avoid signed overflow soft lockup
https://git.kernel.org/netdev/net/c/816e90057ab1
You are awesome, thank you!
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