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Commit b9a24bb7 authored by WANG Cong's avatar WANG Cong Committed by David S. Miller
Browse files

net_sched: properly handle failure case of tcf_exts_init() 



After commit 22dc13c8 ("net_sched: convert tcf_exts from list to pointer array")
we do dynamic allocation in tcf_exts_init(), therefore we need
to handle the ENOMEM case properly.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c1346a7e

include/net/pkt_cls.h

+4 −2
Original line number Diff line number Diff line
@@ -69,17 +69,19 @@ struct tcf_exts { 
	int police;

};



static inline void tcf_exts_init(struct tcf_exts *exts, int action, int police)

static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police)

{

#ifdef CONFIG_NET_CLS_ACT

	exts->type = 0;

	exts->nr_actions = 0;

	exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),

				GFP_KERNEL);

	WARN_ON(!exts->actions); /* TODO: propagate the error to callers */

	if (!exts->actions)

		return -ENOMEM;

#endif

	exts->action = action;

	exts->police = police;

	return 0;

}



/**

net/sched/cls_basic.c

+9 −3
Original line number Diff line number Diff line
@@ -138,10 +138,12 @@ static int basic_set_parms(struct net *net, struct tcf_proto *tp, 
	struct tcf_exts e;

	struct tcf_ematch_tree t;



	tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE);

	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);

	err = tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE);

	if (err < 0)

		return err;

	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);

	if (err < 0)

		goto errout;



	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t);

	if (err < 0)
@@ -189,7 +191,10 @@ static int basic_change(struct net *net, struct sk_buff *in_skb, 
	if (!fnew)

		return -ENOBUFS;



	tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);

	err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);

	if (err < 0)

		goto errout;



	err = -EINVAL;

	if (handle) {

		fnew->handle = handle;
@@ -226,6 +231,7 @@ static int basic_change(struct net *net, struct sk_buff *in_skb, 


	return 0;

errout:

	tcf_exts_destroy(&fnew->exts);

	kfree(fnew);

	return err;

}

net/sched/cls_bpf.c

+17 −10
Original line number Diff line number Diff line
@@ -311,17 +311,19 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, 
	if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))

		return -EINVAL;



	tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);

	ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);

	ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);

	if (ret < 0)

		return ret;

	ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);

	if (ret < 0)

		goto errout;



	if (tb[TCA_BPF_FLAGS]) {

		u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);



		if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {

			tcf_exts_destroy(&exts);

			return -EINVAL;

			ret = -EINVAL;

			goto errout;

		}



		have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
@@ -331,10 +333,8 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, 


	ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :

		       cls_bpf_prog_from_efd(tb, prog, tp);

	if (ret < 0) {

		tcf_exts_destroy(&exts);

		return ret;

	}

	if (ret < 0)

		goto errout;



	if (tb[TCA_BPF_CLASSID]) {

		prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
@@ -343,6 +343,10 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, 


	tcf_exts_change(tp, &prog->exts, &exts);

	return 0;



errout:

	tcf_exts_destroy(&exts);

	return ret;

}



static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
@@ -388,7 +392,9 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 
	if (!prog)

		return -ENOBUFS;



	tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);

	ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);

	if (ret < 0)

		goto errout;



	if (oldprog) {

		if (handle && oldprog->handle != handle) {
@@ -420,9 +426,10 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 


	*arg = (unsigned long) prog;

	return 0;



errout:

	tcf_exts_destroy(&prog->exts);

	kfree(prog);



	return ret;

}

net/sched/cls_cgroup.c

+10 −3
Original line number Diff line number Diff line
@@ -93,7 +93,9 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb, 
	if (!new)

		return -ENOBUFS;



	tcf_exts_init(&new->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);

	err = tcf_exts_init(&new->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);

	if (err < 0)

		goto errout;

	new->handle = handle;

	new->tp = tp;

	err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS],
@@ -101,10 +103,14 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb, 
	if (err < 0)

		goto errout;



	tcf_exts_init(&e, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);

	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);

	err = tcf_exts_init(&e, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);

	if (err < 0)

		goto errout;

	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);

	if (err < 0) {

		tcf_exts_destroy(&e);

		goto errout;

	}



	err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &t);

	if (err < 0) {
@@ -120,6 +126,7 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb, 
		call_rcu(&head->rcu, cls_cgroup_destroy_rcu);

	return 0;

errout:

	tcf_exts_destroy(&new->exts);

	kfree(new);

	return err;

}

net/sched/cls_flow.c

+16 −10
Original line number Diff line number Diff line
@@ -418,10 +418,12 @@ static int flow_change(struct net *net, struct sk_buff *in_skb, 
			return -EOPNOTSUPP;

	}



	tcf_exts_init(&e, TCA_FLOW_ACT, TCA_FLOW_POLICE);

	err = tcf_exts_init(&e, TCA_FLOW_ACT, TCA_FLOW_POLICE);

	if (err < 0)

		goto err1;

	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);

	if (err < 0)

		return err;

		goto err1;



	err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);

	if (err < 0)
@@ -432,13 +434,15 @@ static int flow_change(struct net *net, struct sk_buff *in_skb, 
	if (!fnew)

		goto err2;



	tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE);

	err = tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE);

	if (err < 0)

		goto err3;



	fold = (struct flow_filter *)*arg;

	if (fold) {

		err = -EINVAL;

		if (fold->handle != handle && handle)

			goto err2;

			goto err3;



		/* Copy fold into fnew */

		fnew->tp = fold->tp;
@@ -458,31 +462,31 @@ static int flow_change(struct net *net, struct sk_buff *in_skb, 
		if (tb[TCA_FLOW_MODE])

			mode = nla_get_u32(tb[TCA_FLOW_MODE]);

		if (mode != FLOW_MODE_HASH && nkeys > 1)

			goto err2;

			goto err3;



		if (mode == FLOW_MODE_HASH)

			perturb_period = fold->perturb_period;

		if (tb[TCA_FLOW_PERTURB]) {

			if (mode != FLOW_MODE_HASH)

				goto err2;

				goto err3;

			perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;

		}

	} else {

		err = -EINVAL;

		if (!handle)

			goto err2;

			goto err3;

		if (!tb[TCA_FLOW_KEYS])

			goto err2;

			goto err3;



		mode = FLOW_MODE_MAP;

		if (tb[TCA_FLOW_MODE])

			mode = nla_get_u32(tb[TCA_FLOW_MODE]);

		if (mode != FLOW_MODE_HASH && nkeys > 1)

			goto err2;

			goto err3;



		if (tb[TCA_FLOW_PERTURB]) {

			if (mode != FLOW_MODE_HASH)

				goto err2;

				goto err3;

			perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;

		}
@@ -542,6 +546,8 @@ static int flow_change(struct net *net, struct sk_buff *in_skb, 
		call_rcu(&fold->rcu, flow_destroy_filter);

	return 0;



err3:

	tcf_exts_destroy(&fnew->exts);

err2:

	tcf_em_tree_destroy(&t);

	kfree(fnew);