From 71bcb09a57894fa35591ce93dd972065eeecb63a Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Tue, 25 Nov 2008 21:13:31 -0800 Subject: [PATCH] tc: check for errors in gen_rate_estimator creation The functions gen_new_estimator and gen_replace_estimator can return errors, but they were being ignored. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/sched/act_police.c | 25 +++++++++++++++++-------- net/sched/sch_api.c | 7 +++++-- net/sched/sch_cbq.c | 33 ++++++++++++++++++++++++--------- net/sched/sch_drr.c | 26 ++++++++++++++++++-------- net/sched/sch_hfsc.c | 25 ++++++++++++++++++------- net/sched/sch_htb.c | 22 +++++++++++++++------- 6 files changed, 97 insertions(+), 41 deletions(-) diff --git a/net/sched/act_police.c b/net/sched/act_police.c index 38015b493947..e19a0261144a 100644 --- a/net/sched/act_police.c +++ b/net/sched/act_police.c @@ -185,14 +185,21 @@ override: if (parm->peakrate.rate) { P_tab = qdisc_get_rtab(&parm->peakrate, tb[TCA_POLICE_PEAKRATE]); - if (P_tab == NULL) { - qdisc_put_rtab(R_tab); + if (P_tab == NULL) goto failure; - } } } - /* No failure allowed after this point */ + spin_lock_bh(&police->tcf_lock); + if (est) { + err = gen_replace_estimator(&police->tcf_bstats, + &police->tcf_rate_est, + &police->tcf_lock, est); + if (err) + goto failure_unlock; + } + + /* No failure allowed after this point */ if (R_tab != NULL) { qdisc_put_rtab(police->tcfp_R_tab); police->tcfp_R_tab = R_tab; @@ -217,10 +224,6 @@ override: if (tb[TCA_POLICE_AVRATE]) police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]); - if (est) - gen_replace_estimator(&police->tcf_bstats, - &police->tcf_rate_est, - &police->tcf_lock, est); spin_unlock_bh(&police->tcf_lock); if (ret != ACT_P_CREATED) @@ -238,7 +241,13 @@ override: a->priv = police; return ret; +failure_unlock: + spin_unlock_bh(&police->tcf_lock); failure: + if (P_tab) + qdisc_put_rtab(P_tab); + if (R_tab) + qdisc_put_rtab(R_tab); if (ret == ACT_P_CREATED) kfree(police); return err; diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 3fcfd4ef11d1..f859dd5fabf4 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -880,9 +880,12 @@ static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) sch->stab = stab; if (tca[TCA_RATE]) + /* NB: ignores errors from replace_estimator + because change can't be undone. */ gen_replace_estimator(&sch->bstats, &sch->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE]); + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + return 0; } diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c index 3a9569a3396c..9e43ed949167 100644 --- a/net/sched/sch_cbq.c +++ b/net/sched/sch_cbq.c @@ -1765,11 +1765,23 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t } if (tb[TCA_CBQ_RATE]) { - rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]); + rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), + tb[TCA_CBQ_RTAB]); if (rtab == NULL) return -EINVAL; } + if (tca[TCA_RATE]) { + err = gen_replace_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) { + if (rtab) + qdisc_put_rtab(rtab); + return err; + } + } + /* Change class parameters */ sch_tree_lock(sch); @@ -1805,10 +1817,6 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t sch_tree_unlock(sch); - if (tca[TCA_RATE]) - gen_replace_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE]); return 0; } @@ -1855,6 +1863,17 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t cl = kzalloc(sizeof(*cl), GFP_KERNEL); if (cl == NULL) goto failure; + + if (tca[TCA_RATE]) { + err = gen_new_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) { + kfree(cl); + goto failure; + } + } + cl->R_tab = rtab; rtab = NULL; cl->refcnt = 1; @@ -1896,10 +1915,6 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t qdisc_class_hash_grow(sch, &q->clhash); - if (tca[TCA_RATE]) - gen_new_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), tca[TCA_RATE]); - *arg = (unsigned long)cl; return 0; diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c index e7a7e87b141a..f6b4fa97df70 100644 --- a/net/sched/sch_drr.c +++ b/net/sched/sch_drr.c @@ -82,15 +82,19 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid, quantum = psched_mtu(qdisc_dev(sch)); if (cl != NULL) { + if (tca[TCA_RATE]) { + err = gen_replace_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) + return err; + } + sch_tree_lock(sch); if (tb[TCA_DRR_QUANTUM]) cl->quantum = quantum; sch_tree_unlock(sch); - if (tca[TCA_RATE]) - gen_replace_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE]); return 0; } @@ -106,10 +110,16 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid, if (cl->qdisc == NULL) cl->qdisc = &noop_qdisc; - if (tca[TCA_RATE]) - gen_replace_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE]); + if (tca[TCA_RATE]) { + err = gen_replace_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) { + qdisc_destroy(cl->qdisc); + kfree(cl); + return err; + } + } sch_tree_lock(sch); qdisc_class_hash_insert(&q->clhash, &cl->common); diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index 613179c9969c..45c31b1a4e1d 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -1018,6 +1018,14 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, } cur_time = psched_get_time(); + if (tca[TCA_RATE]) { + err = gen_replace_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) + return err; + } + sch_tree_lock(sch); if (rsc != NULL) hfsc_change_rsc(cl, rsc, cur_time); @@ -1034,10 +1042,6 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, } sch_tree_unlock(sch); - if (tca[TCA_RATE]) - gen_replace_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE]); return 0; } @@ -1063,6 +1067,16 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, if (cl == NULL) return -ENOBUFS; + if (tca[TCA_RATE]) { + err = gen_new_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) { + kfree(cl); + return err; + } + } + if (rsc != NULL) hfsc_change_rsc(cl, rsc, 0); if (fsc != NULL) @@ -1093,9 +1107,6 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, qdisc_class_hash_grow(sch, &q->clhash); - if (tca[TCA_RATE]) - gen_new_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), tca[TCA_RATE]); *arg = (unsigned long)cl; return 0; } diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 3a119f576bb3..8a4519989732 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1332,9 +1332,14 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, if ((cl = kzalloc(sizeof(*cl), GFP_KERNEL)) == NULL) goto failure; - gen_new_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE] ? : &est.nla); + err = gen_new_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE] ? : &est.nla); + if (err) { + kfree(cl); + goto failure; + } + cl->refcnt = 1; cl->children = 0; INIT_LIST_HEAD(&cl->un.leaf.drop_list); @@ -1386,10 +1391,13 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, if (parent) parent->children++; } else { - if (tca[TCA_RATE]) - gen_replace_estimator(&cl->bstats, &cl->rate_est, - qdisc_root_sleeping_lock(sch), - tca[TCA_RATE]); + if (tca[TCA_RATE]) { + err = gen_replace_estimator(&cl->bstats, &cl->rate_est, + qdisc_root_sleeping_lock(sch), + tca[TCA_RATE]); + if (err) + return err; + } sch_tree_lock(sch); } -- 2.39.5