[PATCH v3 10/11] net: sched: atomically check-allocate action

Vlad Buslov
2018-05-27T21:26:46Z

Implement function that atomically checks if action exists and either takes
reference to it, or allocates idr slot for action index to prevent
concurrent allocations of actions with same index. Use EBUSY error pointer
to indicate that idr slot is reserved.

Implement cleanup helper function that removes temporary error pointer from
idr. (in case of error between idr allocation and insertion of newly
created action to specified index)

Refactor all action init functions to insert new action to idr using this
API.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
---
Changes from V1 to V2:
- Remove unique idr insertion function. Change original idr insert to do
the same thing.
- Refactor action check-alloc code into standalone function.

include/net/act_api.h | 3 ++
net/sched/act_api.c | 92 ++++++++++++++++++++++++++++++++++++----------
net/sched/act_bpf.c | 11 ++++--
net/sched/act_connmark.c | 10 +++--
net/sched/act_csum.c | 11 ++++--
net/sched/act_gact.c | 11 ++++--
net/sched/act_ife.c | 6 ++-
net/sched/act_ipt.c | 13 ++++++-
net/sched/act_mirred.c | 16 ++++++--
net/sched/act_nat.c | 11 ++++--
net/sched/act_pedit.c | 15 ++++++--
net/sched/act_police.c | 9 ++++-
net/sched/act_sample.c | 11 ++++--
net/sched/act_simple.c | 11 +++++-
net/sched/act_skbedit.c | 11 +++++-
net/sched/act_skbmod.c | 11 +++++-
net/sched/act_tunnel_key.c | 9 ++++-
net/sched/act_vlan.c | 17 ++++++++-
18 files changed, 218 insertions(+), 60 deletions(-)

diff --git a/include/net/act_api.h b/include/net/act_api.h
index d256e20507b9..cd4547476074 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -154,6 +154,9 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
int bind, bool cpustats);
void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);

+void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
+int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
+ struct tc_action **a, int bind);
int tcf_idr_delete_index(struct tc_action_net *tn, u32 index);
int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index eefe8c2fe667..9511502e1cbb 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -303,7 +303,9 @@ static bool __tcf_idr_check(struct tc_action_net *tn, u32 index,

spin_lock(&idrinfo->lock);
p = idr_find(&idrinfo->action_idr, index);
- if (p) {
+ if (IS_ERR(p)) {
+ p = NULL;
+ } else if (p) {
refcount_inc(&p->tcfa_refcnt);
if (bind)
atomic_inc(&p->tcfa_bindcnt);
@@ -371,7 +373,6 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
{
struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
struct tcf_idrinfo *idrinfo = tn->idrinfo;
- struct idr *idr = &idrinfo->action_idr;
int err = -ENOMEM;

if (unlikely(!p))
@@ -389,20 +390,6 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
goto err2;
}
spin_lock_init(&p->tcfa_lock);
- idr_preload(GFP_KERNEL);
- spin_lock(&idrinfo->lock);
- /* user doesn't specify an index */
- if (!index) {
- index = 1;
- err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
- } else {
- err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
- }
- spin_unlock(&idrinfo->lock);
- idr_preload_end();
- if (err)
- goto err3;
-
p->tcfa_index = index;
p->tcfa_tm.install = jiffies;
p->tcfa_tm.lastuse = jiffies;
@@ -412,7 +399,7 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
&p->tcfa_rate_est,
&p->tcfa_lock, NULL, est);
if (err)
- goto err4;
+ goto err3;
}

p->idrinfo = idrinfo;
@@ -420,8 +407,6 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
INIT_LIST_HEAD(&p->list);
*a = p;
return 0;
-err4:
- idr_remove(idr, index);
err3:
free_percpu(p->cpu_qstats);
err2:
@@ -437,11 +422,78 @@ void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
struct tcf_idrinfo *idrinfo = tn->idrinfo;

spin_lock(&idrinfo->lock);
- idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
+ /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
+ WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
spin_unlock(&idrinfo->lock);
}
EXPORT_SYMBOL(tcf_idr_insert);

+/* Cleanup idr index that was allocated but not initialized. */
+
+void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
+{
+ struct tcf_idrinfo *idrinfo = tn->idrinfo;
+
+ spin_lock(&idrinfo->lock);
+ /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
+ WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
+ spin_unlock(&idrinfo->lock);
+}
+EXPORT_SYMBOL(tcf_idr_cleanup);
+
+/* Check if action with specified index exists. If actions is found, increments
+ * its reference and bind counters, and return 1. Otherwise insert temporary
+ * error pointer (to prevent concurrent users from inserting actions with same
+ * index) and return 0.
+ */
+
+int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
+ struct tc_action **a, int bind)
+{
+ struct tcf_idrinfo *idrinfo = tn->idrinfo;
+ struct tc_action *p;
+ int ret;
+
+again:
+ spin_lock(&idrinfo->lock);
+ if (*index) {
+ p = idr_find(&idrinfo->action_idr, *index);
+ if (IS_ERR(p)) {
+ /* This means that another process allocated
+ * index but did not assign the pointer yet.
+ */
+ spin_unlock(&idrinfo->lock);
+ goto again;
+ }
+
+ if (p) {
+ refcount_inc(&p->tcfa_refcnt);
+ if (bind)
+ atomic_inc(&p->tcfa_bindcnt);
+ *a = p;
+ ret = 1;
+ } else {
+ *a = NULL;
+ ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
+ *index, GFP_ATOMIC);
+ if (!ret)
+ idr_replace(&idrinfo->action_idr,
+ ERR_PTR(-EBUSY), *index);
+ }
+ } else {
+ *index = 1;
+ *a = NULL;
+ ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
+ UINT_MAX, GFP_ATOMIC);
+ if (!ret)
+ idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
+ *index);
+ }
+ spin_unlock(&idrinfo->lock);
+ return ret;
+}
+EXPORT_SYMBOL(tcf_idr_check_alloc);
+
void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
struct tcf_idrinfo *idrinfo)
{
diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index d3f4ac6f2c4b..06f743d8ed41 100644
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c
@@ -299,14 +299,17 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,

parm = nla_data(tb[TCA_ACT_BPF_PARMS]);

- if (!tcf_idr_check(tn, parm->index, act, bind)) {
+ ret = tcf_idr_check_alloc(tn, &parm->index, act, bind);
+ if (!ret) {
ret = tcf_idr_create(tn, parm->index, est, act,
&act_bpf_ops, bind, true);
- if (ret < 0)
+ if (ret < 0) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }

res = ACT_P_CREATED;
- } else {
+ } else if (ret > 0) {
/* Don't override defaults. */
if (bind)
return 0;
@@ -315,6 +318,8 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
tcf_idr_release(*act, bind);
return -EEXIST;
}
+ } else {
+ return ret;
}

is_bpf = tb[TCA_ACT_BPF_OPS_LEN] && tb[TCA_ACT_BPF_OPS];
diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
index 701e90244eff..1e31f0e448e2 100644
--- a/net/sched/act_connmark.c
+++ b/net/sched/act_connmark.c
@@ -118,11 +118,14 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,

parm = nla_data(tb[TCA_CONNMARK_PARMS]);

- if (!tcf_idr_check(tn, parm->index, a, bind)) {
+ ret = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (!ret) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_connmark_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }

ci = to_connmark(*a);
ci->tcf_action = parm->action;
@@ -131,7 +134,7 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,

tcf_idr_insert(tn, *a);
ret = ACT_P_CREATED;
- } else {
+ } else if (ret > 0) {
ci = to_connmark(*a);
if (bind)
return 0;
@@ -142,6 +145,7 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,
/* replacing action and zone */
ci->tcf_action = parm->action;
ci->zone = parm->zone;
+ ret = 0;
}

return ret;
diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index 5dbee136b0a1..bd232d3bd022 100644
--- a/net/sched/act_csum.c
+++ b/net/sched/act_csum.c
@@ -67,19 +67,24 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
return -EINVAL;
parm = nla_data(tb[TCA_CSUM_PARMS]);

- if (!tcf_idr_check(tn, parm->index, a, bind)) {
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (!err) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_csum_ops, bind, true);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
ret = ACT_P_CREATED;
- } else {
+ } else if (err > 0) {
if (bind)/* dont override defaults */
return 0;
if (!ovr) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
+ } else {
+ return err;
}

p = to_tcf_csum(*a);
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index 11c4de3f344e..661b72b9147d 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -91,19 +91,24 @@ static int tcf_gact_init(struct net *net, struct nlattr *nla,
}
#endif

- if (!tcf_idr_check(tn, parm->index, a, bind)) {
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (!err) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_gact_ops, bind, true);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
ret = ACT_P_CREATED;
- } else {
+ } else if (err > 0) {
if (bind)/* dont override defaults */
return 0;
if (!ovr) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
+ } else {
+ return err;
}

gact = to_gact(*a);
diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
index 3dd3d79c5a4b..5bf0e79796c0 100644
--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -483,7 +483,10 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
if (!p)
return -ENOMEM;

- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind) {
kfree(p);
return 0;
@@ -493,6 +496,7 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
ret = tcf_idr_create(tn, parm->index, est, a, &act_ife_ops,
bind, true);
if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
kfree(p);
return ret;
}
diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 85e85dfba401..0dc787a57798 100644
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -119,13 +119,18 @@ static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla,
if (tb[TCA_IPT_INDEX] != NULL)
index = nla_get_u32(tb[TCA_IPT_INDEX]);

- exists = tcf_idr_check(tn, index, a, bind);
+ err = tcf_idr_check_alloc(tn, &index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, index);
return -EINVAL;
}

@@ -133,14 +138,18 @@ static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla,
if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, index);
return -EINVAL;
}

if (!exists) {
ret = tcf_idr_create(tn, index, est, a, ops, bind,
false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, index);
return ret;
+ }
ret = ACT_P_CREATED;
} else {
if (bind)/* dont override defaults */
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index e08aed06d7f8..6afd89a36c69 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -79,7 +79,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
struct tcf_mirred *m;
struct net_device *dev;
bool exists = false;
- int ret;
+ int ret, err;

if (!nla) {
NL_SET_ERR_MSG_MOD(extack, "Mirred requires attributes to be passed");
@@ -94,7 +94,10 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
}
parm = nla_data(tb[TCA_MIRRED_PARMS]);

- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

@@ -107,6 +110,8 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
default:
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
NL_SET_ERR_MSG_MOD(extack, "Unknown mirred option");
return -EINVAL;
}
@@ -115,6 +120,8 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
if (dev == NULL) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -ENODEV;
}
mac_header_xmit = dev_is_mac_header_xmit(dev);
@@ -124,13 +131,16 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,

if (!exists) {
if (!dev) {
+ tcf_idr_cleanup(tn, parm->index);
NL_SET_ERR_MSG_MOD(extack, "Specified device does not exist");
return -EINVAL;
}
ret = tcf_idr_create(tn, parm->index, est, a,
&act_mirred_ops, bind, true);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
ret = ACT_P_CREATED;
} else if (!ovr) {
tcf_idr_release(*a, bind);
diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index 1f91e8e66c0f..4dd9188a72fd 100644
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -57,19 +57,24 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
return -EINVAL;
parm = nla_data(tb[TCA_NAT_PARMS]);

- if (!tcf_idr_check(tn, parm->index, a, bind)) {
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (!err) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_nat_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
ret = ACT_P_CREATED;
- } else {
+ } else if (err > 0) {
if (bind)
return 0;
if (!ovr) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
+ } else {
+ return err;
}
p = to_tcf_nat(*a);

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index fbf283f2ac34..2bd1d3f61488 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -167,13 +167,18 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
if (IS_ERR(keys_ex))
return PTR_ERR(keys_ex);

- if (!tcf_idr_check(tn, parm->index, a, bind)) {
- if (!parm->nkeys)
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (!err) {
+ if (!parm->nkeys) {
+ tcf_idr_cleanup(tn, parm->index);
return -EINVAL;
+ }
ret = tcf_idr_create(tn, parm->index, est, a,
&act_pedit_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
p = to_pedit(*a);
keys = kmalloc(ksize, GFP_KERNEL);
if (keys == NULL) {
@@ -182,7 +187,7 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
return -ENOMEM;
}
ret = ACT_P_CREATED;
- } else {
+ } else if (err > 0) {
if (bind)
return 0;
if (!ovr) {
@@ -197,6 +202,8 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
return -ENOMEM;
}
}
+ } else {
+ return err;
}

spin_lock_bh(&p->tcf_lock);
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 99335cca739e..1f3192ea8df7 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -101,15 +101,20 @@ static int tcf_act_police_init(struct net *net, struct nlattr *nla,
return -EINVAL;

parm = nla_data(tb[TCA_POLICE_TBF]);
- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

if (!exists) {
ret = tcf_idr_create(tn, parm->index, NULL, a,
&act_police_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
ret = ACT_P_CREATED;
} else if (!ovr) {
tcf_idr_release(*a, bind);
diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index a8582e1347db..3079e7be5bde 100644
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -46,7 +46,7 @@ static int tcf_sample_init(struct net *net, struct nlattr *nla,
struct tc_sample *parm;
struct tcf_sample *s;
bool exists = false;
- int ret;
+ int ret, err;

if (!nla)
return -EINVAL;
@@ -59,15 +59,20 @@ static int tcf_sample_init(struct net *net, struct nlattr *nla,

parm = nla_data(tb[TCA_SAMPLE_PARMS]);

- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_sample_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
ret = ACT_P_CREATED;
} else if (!ovr) {
tcf_idr_release(*a, bind);
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 78fffd329ed9..2cc874f791df 100644
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -101,13 +101,18 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
return -EINVAL;

parm = nla_data(tb[TCA_DEF_PARMS]);
- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

if (tb[TCA_DEF_DATA] == NULL) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -EINVAL;
}

@@ -116,8 +121,10 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_simp_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }

d = to_defact(*a);
ret = alloc_defdata(d, defdata);
diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index c0607d1319eb..29a15172a99d 100644
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -117,21 +117,28 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,

parm = nla_data(tb[TCA_SKBEDIT_PARMS]);

- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

if (!flags) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -EINVAL;
}

if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_skbedit_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }

d = to_skbedit(*a);
ret = ACT_P_CREATED;
diff --git a/net/sched/act_skbmod.c b/net/sched/act_skbmod.c
index e844381af066..cdc6bacfb190 100644
--- a/net/sched/act_skbmod.c
+++ b/net/sched/act_skbmod.c
@@ -128,21 +128,28 @@ static int tcf_skbmod_init(struct net *net, struct nlattr *nla,
if (parm->flags & SKBMOD_F_SWAPMAC)
lflags = SKBMOD_F_SWAPMAC;

- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

if (!lflags) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -EINVAL;
}

if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_skbmod_ops, bind, true);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }

ret = ACT_P_CREATED;
} else if (!ovr) {
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index bd53f39a345b..4679b620af12 100644
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -99,7 +99,10 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
return -EINVAL;

parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

@@ -162,7 +165,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
ret = tcf_idr_create(tn, parm->index, est, a,
&act_tunnel_key_ops, bind, true);
if (ret)
- return ret;
+ goto err_out;

ret = ACT_P_CREATED;
} else if (!ovr) {
@@ -198,6 +201,8 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
err_out:
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return ret;
}

diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
index 4ac0d565e437..bae9822837d7 100644
--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -134,7 +134,10 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
if (!tb[TCA_VLAN_PARMS])
return -EINVAL;
parm = nla_data(tb[TCA_VLAN_PARMS]);
- exists = tcf_idr_check(tn, parm->index, a, bind);
+ err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
if (exists && bind)
return 0;

@@ -146,12 +149,16 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -EINVAL;
}
push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
if (push_vid >= VLAN_VID_MASK) {
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -ERANGE;
}

@@ -162,6 +169,8 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
case htons(ETH_P_8021AD):
break;
default:
+ if (!exists)
+ tcf_idr_cleanup(tn, parm->index);
return -EPROTONOSUPPORT;
}
} else {
@@ -174,6 +183,8 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
default:
if (exists)
tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, parm->index);
return -EINVAL;
}
action = parm->v_action;
@@ -181,8 +192,10 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_vlan_ops, bind, true);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }

ret = ACT_P_CREATED;
} else if (!ovr) {
--
2.7.5