[PATCH net v6 0/1] net/sched: act_gate: snapshot parameters with RCU on replace

[Paul Moses <p@1g4.org>]

This series fixes a schedule lifetime race in `act_gate` between the
control-plane replace path and the running hrtimer callback
(`gate_timer_func`).

Changes since v5:
- Reset stale err before optional old-entry copy on REPLACE
- Centralize goto_ch cleanup at release_idr for init error unwinding
- Snapshot replace defaults from old params once 
- Drop redundant early clockid pre-validation and remove clockid_provided
- Resolve clockid once into tk_offset and pass clockid/tk_offset as scalars
- Deduplicate init error cleanup by falling through shared
  err_free/release_idr
- Deduplicate empty entry list rejection on create into a single check
- Rename lock-only accessor helper to tcf_gate_params_locked()
- Simplify entry-list handling by deriving use_old_entries from attributes
- Remove replace-path defensive old_p NULL handling
- Keep helper name gate_setup_timer()
- Align cleanup dereference with act_vlan using
  rcu_dereference_protected(gact->param, 1) and call_rcu()
- Switch dump to lockless RCU read-side access and use
  READ_ONCE(gact->tcf_action)
- Compute need_cancel only on replace and keep
  gate_timer_needs_cancel() focused

Paul Moses (1):
  net/sched: act_gate: snapshot parameters with RCU on replace

 include/net/tc_act/tc_gate.h |  33 ++++-
 net/sched/act_gate.c         | 275 ++++++++++++++++++++++++-----------
 2 files changed, 219 insertions(+), 89 deletions(-)

-- 
2.53.0