[NET_SCHED]: act_api: use PTR_ERR in tcf_action_init/tcf_action_get

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 39 insertions, 32 deletions

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 2fe0345ddcb1..ea80f82dbb6a 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -18,6 +18,7 @@
 #include <linux/skbuff.h>
 #include <linux/init.h>
 #include <linux/kmod.h>
+#include <linux/err.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
 #include <net/sch_generic.h>
@@ -463,15 +464,16 @@ errout:
 }
 
 struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
-                                    char *name, int ovr, int bind, int *err)
+                                    char *name, int ovr, int bind)
 {
         struct tc_action *a;
         struct tc_action_ops *a_o;
         char act_name[IFNAMSIZ];
         struct nlattr *tb[TCA_ACT_MAX+1];
         struct nlattr *kind;
+        int err;
 
-        *err = -EINVAL;
+        err = -EINVAL;
 
         if (name == NULL) {
                 if (nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL) < 0)
@@ -502,36 +504,35 @@ struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
                  * indicate this using -EAGAIN.
                  */
                 if (a_o != NULL) {
-                        *err = -EAGAIN;
+                        err = -EAGAIN;
                         goto err_mod;
                 }
 #endif
-                *err = -ENOENT;
+                err = -ENOENT;
                 goto err_out;
         }
 
-        *err = -ENOMEM;
+        err = -ENOMEM;
         a = kzalloc(sizeof(*a), GFP_KERNEL);
         if (a == NULL)
                 goto err_mod;
 
         /* backward compatibility for policer */
         if (name == NULL)
-                *err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
+                err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
         else
-                *err = a_o->init(nla, est, a, ovr, bind);
-        if (*err < 0)
+                err = a_o->init(nla, est, a, ovr, bind);
+        if (err < 0)
                 goto err_free;
 
         /* module count goes up only when brand new policy is created
            if it exists and is only bound to in a_o->init() then
            ACT_P_CREATED is not returned (a zero is).
         */
-        if (*err != ACT_P_CREATED)
+        if (err != ACT_P_CREATED)
                 module_put(a_o->owner);
         a->ops = a_o;
 
-        *err = 0;
         return a;
 
 err_free:
@@ -539,24 +540,22 @@ err_free:
 err_mod:
         module_put(a_o->owner);
 err_out:
-        return NULL;
+        return ERR_PTR(err);
 }
 
 struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
-                                  char *name, int ovr, int bind, int *err)
+                                  char *name, int ovr, int bind)
 {
         struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
         struct tc_action *head = NULL, *act, *act_prev = NULL;
         int i;
 
-        if (nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL) < 0) {
-                *err = -EINVAL;
-                return head;
-        }
+        if (nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL) < 0)
+                return ERR_PTR(-EINVAL);
 
         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
-                act = tcf_action_init_1(tb[i], est, name, ovr, bind, err);
-                if (act == NULL)
+                act = tcf_action_init_1(tb[i], est, name, ovr, bind);
+                if (IS_ERR(act))
                         goto err;
                 act->order = i;
 
@@ -571,7 +570,7 @@ struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
 err:
         if (head != NULL)
                 tcf_action_destroy(head, bind);
-        return NULL;
+        return act;
 }
 
 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
@@ -668,44 +667,46 @@ act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
 }
 
 static struct tc_action *
-tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int *err)
+tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
 {
         struct nlattr *tb[TCA_ACT_MAX+1];
         struct tc_action *a;
         int index;
+        int err;
 
-        *err = -EINVAL;
+        err = -EINVAL;
         if (nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL) < 0)
-                return NULL;
+                goto err_out;
 
         if (tb[TCA_ACT_INDEX] == NULL ||
             nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
-                return NULL;
+                goto err_out;
         index = *(int *)nla_data(tb[TCA_ACT_INDEX]);
 
-        *err = -ENOMEM;
+        err = -ENOMEM;
         a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
         if (a == NULL)
-                return NULL;
+                goto err_out;
 
-        *err = -EINVAL;
+        err = -EINVAL;
         a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
         if (a->ops == NULL)
                 goto err_free;
         if (a->ops->lookup == NULL)
                 goto err_mod;
-        *err = -ENOENT;
+        err = -ENOENT;
         if (a->ops->lookup(a, index) == 0)
                 goto err_mod;
 
         module_put(a->ops->owner);
-        *err = 0;
         return a;
+
 err_mod:
         module_put(a->ops->owner);
 err_free:
         kfree(a);
-        return NULL;
+err_out:
+        return ERR_PTR(err);
 }
 
 static void cleanup_a(struct tc_action *act)
@@ -816,9 +817,11 @@ tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
         }
 
         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
-                act = tcf_action_get_1(tb[i], n, pid, &ret);
-                if (act == NULL)
+                act = tcf_action_get_1(tb[i], n, pid);
+                if (IS_ERR(act)) {
+                        ret = PTR_ERR(act);
                         goto err;
+                }
                 act->order = i;
 
                 if (head == NULL)
@@ -912,9 +915,13 @@ tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
         struct tc_action *a;
         u32 seq = n->nlmsg_seq;
 
-        act = tcf_action_init(nla, NULL, NULL, ovr, 0, &ret);
+        act = tcf_action_init(nla, NULL, NULL, ovr, 0);
         if (act == NULL)
                 goto done;
+        if (IS_ERR(act)) {
+                ret = PTR_ERR(act);
+                goto done;
+        }
 
         /* dump then free all the actions after update; inserted policy
          * stays intact