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Cong Wang says: ==================== net_sched: make ->qlen_notify() idempotent Gerrard reported a vulnerability exists in fq_codel where manipulating the MTU can cause codel_dequeue() to drop all packets. The parent qdisc's sch->q.qlen is only updated via ->qlen_notify() if the fq_codel queue remains non-empty after the drops. This discrepancy in qlen between fq_codel and its parent can lead to a use-after-free condition. Let's fix this by making all existing ->qlen_notify() idempotent so that the sch->q.qlen check will be no longer necessary. Patch 1~5 make all existing ->qlen_notify() idempotent to prepare for patch 6 which removes the sch->q.qlen check. They are followed by 5 selftests for each type of Qdisc's we touch here. All existing and new Qdisc selftests pass after this patchset. Fixes:4b549a2ef4("fq_codel: Fair Queue Codel AQM") Fixes:76e3cc126b("codel: Controlled Delay AQM") Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> ==================== Link: https://patch.msgid.link/20250403211033.166059-1-xiyou.wangcong@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel
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