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Message-ID: <20090314144528.GA24995@ami.dom.local> Date: Sat, 14 Mar 2009 15:45:28 +0100 From: Jarek Poplawski <jarkao2@...il.com> To: David Miller <davem@...emloft.net> Cc: m0sia@...ia.ru, Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org Subject: [PATCH] pkt_sched: Change misleading code in class delete. While looking for a possible reason of bugzilla report on HTB oops: http://bugzilla.kernel.org/show_bug.cgi?id=12858 I found the code in htb_delete calling htb_destroy_class on zero refcount is very misleading: it can suggest this is a common path, and destroy is called under sch_tree_lock. Actually, this can never happen like this because before deletion cops->get() is done, and after delete a class is still used by tclass_notify. The class destroy is always called from cops->put(), so without sch_tree_lock. This doesn't mean much now (since 2.6.27) because all vulnerable calls were moved from htb_destroy_class to htb_delete, but there was a bug in older kernels. The same change is done for other classful scheds, which, it seems, didn't have similar locking problems here. Reported-by: m0sia@...ia.ru Signed-off-by: Jarek Poplawski <jarkao2@...il.com> --- net/sched/sch_cbq.c | 7 +++++-- net/sched/sch_drr.c | 7 +++++-- net/sched/sch_hfsc.c | 7 +++++-- net/sched/sch_htb.c | 7 +++++-- 4 files changed, 20 insertions(+), 8 deletions(-) diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c index 9e43ed9..002442a 100644 --- a/net/sched/sch_cbq.c +++ b/net/sched/sch_cbq.c @@ -1960,8 +1960,11 @@ static int cbq_delete(struct Qdisc *sch, unsigned long arg) cbq_rmprio(q, cl); sch_tree_unlock(sch); - if (--cl->refcnt == 0) - cbq_destroy_class(sch, cl); + BUG_ON(--cl->refcnt == 0); + /* + * This shouldn't happen: we hold one cops->get() when called + * from tc_ctl_tclass; the destroy is done from cops->put(). + */ return 0; } diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c index e36e94a..00e20d5 100644 --- a/net/sched/sch_drr.c +++ b/net/sched/sch_drr.c @@ -155,8 +155,11 @@ static int drr_delete_class(struct Qdisc *sch, unsigned long arg) drr_purge_queue(cl); qdisc_class_hash_remove(&q->clhash, &cl->common); - if (--cl->refcnt == 0) - drr_destroy_class(sch, cl); + BUG_ON(--cl->refcnt == 0); + /* + * This shouldn't happen: we hold one cops->get() when called + * from tc_ctl_tclass; the destroy is done from cops->put(). + */ sch_tree_unlock(sch); return 0; diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index 74226b2..a516aa4 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -1139,8 +1139,11 @@ hfsc_delete_class(struct Qdisc *sch, unsigned long arg) hfsc_purge_queue(sch, cl); qdisc_class_hash_remove(&q->clhash, &cl->cl_common); - if (--cl->refcnt == 0) - hfsc_destroy_class(sch, cl); + BUG_ON(--cl->refcnt == 0); + /* + * This shouldn't happen: we hold one cops->get() when called + * from tc_ctl_tclass; the destroy is done from cops->put(). + */ sch_tree_unlock(sch); return 0; diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 355974f..a4b682b 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1275,8 +1275,11 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg) if (last_child) htb_parent_to_leaf(q, cl, new_q); - if (--cl->refcnt == 0) - htb_destroy_class(sch, cl); + BUG_ON(--cl->refcnt == 0); + /* + * This shouldn't happen: we hold one cops->get() when called + * from tc_ctl_tclass; the destroy is done from cops->put(). + */ sch_tree_unlock(sch); return 0; -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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