From ec3ed293e76656c1fb5388249e1e61c7d274abfc Mon Sep 17 00:00:00 2001 From: Vlad Buslov Date: Wed, 19 Sep 2018 16:37:29 -0700 Subject: net_sched: change tcf_del_walker() to take idrinfo->lock Action API was changed to work with actions and action_idr in concurrency safe manner, however tcf_del_walker() still uses actions without taking a reference or idrinfo->lock first, and deletes them directly, disregarding possible concurrent delete. Change tcf_del_walker() to take idrinfo->lock while iterating over actions and use new tcf_idr_release_unsafe() to release them while holding the lock. And the blocking function fl_hw_destroy_tmplt() could be called when we put a filter chain, so defer it to a work queue. Signed-off-by: Vlad Buslov [xiyou.wangcong@gmail.com: heavily modify the code and changelog] Signed-off-by: Cong Wang Signed-off-by: David S. Miller --- net/sched/cls_flower.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'net/sched/cls_flower.c') diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index 9aada2d0ef06..92dd5071a708 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -79,6 +79,7 @@ struct fl_flow_tmplt { struct fl_flow_key mask; struct flow_dissector dissector; struct tcf_chain *chain; + struct rcu_work rwork; }; struct cls_fl_head { @@ -1437,14 +1438,22 @@ errout_tb: return ERR_PTR(err); } -static void fl_tmplt_destroy(void *tmplt_priv) +static void fl_tmplt_destroy_work(struct work_struct *work) { - struct fl_flow_tmplt *tmplt = tmplt_priv; + struct fl_flow_tmplt *tmplt = container_of(to_rcu_work(work), + struct fl_flow_tmplt, rwork); fl_hw_destroy_tmplt(tmplt->chain, tmplt); kfree(tmplt); } +static void fl_tmplt_destroy(void *tmplt_priv) +{ + struct fl_flow_tmplt *tmplt = tmplt_priv; + + tcf_queue_work(&tmplt->rwork, fl_tmplt_destroy_work); +} + static int fl_dump_key_val(struct sk_buff *skb, void *val, int val_type, void *mask, int mask_type, int len) -- cgit