[NET_SCHED]: sch_htb/sch_hfsc: fix oops in qlen_notify During both HTB and HFSC class deletion the class is removed from the class hash before calling qdisc_tree_decrease_qlen. This makes the ->get operation in qdisc_tree_decrease_qlen fail, so it passes a NULL pointer to ->qlen_notify, causing an oops. Signed-off-by: Patrick McHardy --- commit 36ab004c1021c259b8780834287494fe630fc9ee tree cad66b55dd7c6954ff9b55b16f791d7474adf6b0 parent 703071b5b93d88d5acb0edd5b9dd86c69ad970f2 author Patrick McHardy Tue, 27 Mar 2007 17:07:50 +0200 committer Patrick McHardy Tue, 27 Mar 2007 18:25:42 +0200 net/sched/sch_hfsc.c | 4 +++- net/sched/sch_htb.c | 6 +++--- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index 396deb7..407c6fb 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -1184,10 +1184,12 @@ hfsc_delete_class(struct Qdisc *sch, unsigned long arg) sch_tree_lock(sch); - list_del(&cl->hlist); list_del(&cl->siblings); hfsc_adjust_levels(cl->cl_parent); + hfsc_purge_queue(sch, cl); + list_del(&cl->hlist); + if (--cl->refcnt == 0) hfsc_destroy_class(sch, cl); diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 97cbb9a..3c3294d 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1380,15 +1380,15 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg) sch_tree_lock(sch); - /* delete from hash and active; remainder in destroy_class */ - hlist_del_init(&cl->hlist); - if (!cl->level) { qlen = cl->un.leaf.q->q.qlen; qdisc_reset(cl->un.leaf.q); qdisc_tree_decrease_qlen(cl->un.leaf.q, qlen); } + /* delete from hash and active; remainder in destroy_class */ + hlist_del_init(&cl->hlist); + if (cl->prio_activity) htb_deactivate(q, cl);