On 01/08/2026 10:42, Ren Wei wrote:
From: Zijie Huang <[email protected]>Deep qdisc hierarchies can lead to excessive recursion in qdisc tree walkers and exhaust the kernel stack. The existing loop check does not cover the create-and-graft path, so a hierarchy can still be extended by creating a new child qdisc below an already deep parent. Store the hierarchy depth in struct Qdisc and update it when qdiscs are grafted. Reject new child qdiscs once the parent is already at the maximum allowed depth. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: [email protected] Reported-by: Vega <[email protected]> Assisted-by: Codex:gpt-5.4 Signed-off-by: Zijie Huang <[email protected]> Signed-off-by: Ren Wei <[email protected]>
Reviewed-by: Victor Nogueira <[email protected]>
