From 494f5063b86cd6e972cb41a27e083c9a3664319d Mon Sep 17 00:00:00 2001 From: Zhengchao Shao Date: Fri, 2 Sep 2022 16:34:29 +0800 Subject: net: sched: fq_codel: remove redundant resource cleanup in fq_codel_init() If fq_codel_init() fails, qdisc_create() invokes fq_codel_destroy() to clear resources. Therefore, remove redundant resource cleanup in fq_codel_init(). Signed-off-by: Zhengchao Shao Signed-off-by: David S. Miller --- net/sched/sch_fq_codel.c | 25 ++++++++----------------- 1 file changed, 8 insertions(+), 17 deletions(-) (limited to 'net') diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c index f16f471daa81..eeea8c6d54e2 100644 --- a/net/sched/sch_fq_codel.c +++ b/net/sched/sch_fq_codel.c @@ -478,26 +478,24 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt, if (opt) { err = fq_codel_change(sch, opt, extack); if (err) - goto init_failure; + return err; } err = tcf_block_get(&q->block, &q->filter_list, sch, extack); if (err) - goto init_failure; + return err; if (!q->flows) { q->flows = kvcalloc(q->flows_cnt, sizeof(struct fq_codel_flow), GFP_KERNEL); - if (!q->flows) { - err = -ENOMEM; - goto init_failure; - } + if (!q->flows) + return -ENOMEM; + q->backlogs = kvcalloc(q->flows_cnt, sizeof(u32), GFP_KERNEL); - if (!q->backlogs) { - err = -ENOMEM; - goto alloc_failure; - } + if (!q->backlogs) + return -ENOMEM; + for (i = 0; i < q->flows_cnt; i++) { struct fq_codel_flow *flow = q->flows + i; @@ -510,13 +508,6 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt, else sch->flags &= ~TCQ_F_CAN_BYPASS; return 0; - -alloc_failure: - kvfree(q->flows); - q->flows = NULL; -init_failure: - q->flows_cnt = 0; - return err; } static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb) -- cgit v1.2.3 From d59f4e1d1fe785e85c33f62136d93c8ea429442f Mon Sep 17 00:00:00 2001 From: Zhengchao Shao Date: Fri, 2 Sep 2022 16:34:30 +0800 Subject: net: sched: htb: remove redundant resource cleanup in htb_init() If htb_init() fails, qdisc_create() invokes htb_destroy() to clear resources. Therefore, remove redundant resource cleanup in htb_init(). Signed-off-by: Zhengchao Shao Signed-off-by: David S. Miller --- net/sched/sch_htb.c | 36 +++++++++--------------------------- 1 file changed, 9 insertions(+), 27 deletions(-) (limited to 'net') diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index dbbb276aecb3..78d0c7549c74 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1102,7 +1102,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, err = qdisc_class_hash_init(&q->clhash); if (err < 0) - goto err_free_direct_qdiscs; + return err; if (tb[TCA_HTB_DIRECT_QLEN]) q->direct_qlen = nla_get_u32(tb[TCA_HTB_DIRECT_QLEN]); @@ -1123,8 +1123,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, qdisc = qdisc_create_dflt(dev_queue, &pfifo_qdisc_ops, TC_H_MAKE(sch->handle, 0), extack); if (!qdisc) { - err = -ENOMEM; - goto err_free_qdiscs; + return -ENOMEM; } htb_set_lockdep_class_child(qdisc); @@ -1142,7 +1141,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, }; err = htb_offload(dev, &offload_opt); if (err) - goto err_free_qdiscs; + return err; /* Defer this assignment, so that htb_destroy skips offload-related * parts (especially calling ndo_setup_tc) on errors. @@ -1150,22 +1149,6 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, q->offload = true; return 0; - -err_free_qdiscs: - for (ntx = 0; ntx < q->num_direct_qdiscs && q->direct_qdiscs[ntx]; - ntx++) - qdisc_put(q->direct_qdiscs[ntx]); - - qdisc_class_hash_destroy(&q->clhash); - /* Prevent use-after-free and double-free when htb_destroy gets called. - */ - q->clhash.hash = NULL; - q->clhash.hashsize = 0; - -err_free_direct_qdiscs: - kfree(q->direct_qdiscs); - q->direct_qdiscs = NULL; - return err; } static void htb_attach_offload(struct Qdisc *sch) @@ -1688,13 +1671,12 @@ static void htb_destroy(struct Qdisc *sch) qdisc_class_hash_destroy(&q->clhash); __qdisc_reset_queue(&q->direct_queue); - if (!q->offload) - return; - - offload_opt = (struct tc_htb_qopt_offload) { - .command = TC_HTB_DESTROY, - }; - htb_offload(dev, &offload_opt); + if (q->offload) { + offload_opt = (struct tc_htb_qopt_offload) { + .command = TC_HTB_DESTROY, + }; + htb_offload(dev, &offload_opt); + } if (!q->direct_qdiscs) return; -- cgit v1.2.3