net_cls_act: Make act_simple use of netlink policy.

Convert to netlink helpers by using netlink policy validation.
As a side effect fixes a leak.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 18 deletions

diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 64b2d136c78..269ab51cd9b 100644
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -6,7 +6,7 @@
  *              as published by the Free Software Foundation; either version
  *              2 of the License, or (at your option) any later version.
  *
- * Authors:     Jamal Hadi Salim (2005)
+ * Authors:     Jamal Hadi Salim (2005-8)
  *
  */
 
@@ -34,6 +34,7 @@ static struct tcf_hashinfo simp_hash_info = {
         .lock   =       &simp_lock,
 };
 
+#define SIMP_MAX_DATA   32
 static int tcf_simp(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
 {
         struct tcf_defact *d = a->priv;
@@ -69,23 +70,24 @@ static int tcf_simp_release(struct tcf_defact *d, int bind)
         return ret;
 }
 
-static int alloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
+static int alloc_defdata(struct tcf_defact *d, char *defdata)
 {
-        d->tcfd_defdata = kmemdup(defdata, datalen, GFP_KERNEL);
+        d->tcfd_defdata = kstrndup(defdata, SIMP_MAX_DATA, GFP_KERNEL);
         if (unlikely(!d->tcfd_defdata))
                 return -ENOMEM;
-        d->tcfd_datalen = datalen;
+
         return 0;
 }
 
-static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)
+static int realloc_defdata(struct tcf_defact *d, char *defdata)
 {
         kfree(d->tcfd_defdata);
-        return alloc_defdata(d, datalen, defdata);
+        return alloc_defdata(d, defdata);
 }
 
 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
         [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) },
+        [TCA_DEF_DATA]  = { .type = NLA_STRING, .len = SIMP_MAX_DATA },
 };
 
 static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
@@ -95,28 +97,24 @@ static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
         struct tc_defact *parm;
         struct tcf_defact *d;
         struct tcf_common *pc;
-        void *defdata;
-        u32 datalen = 0;
+        char *defdata;
         int ret = 0, err;
 
         if (nla == NULL)
                 return -EINVAL;
 
-        err = nla_parse_nested(tb, TCA_DEF_MAX, nla, NULL);
+        err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy);
         if (err < 0)
                 return err;
 
         if (tb[TCA_DEF_PARMS] == NULL)
                 return -EINVAL;
 
-        parm = nla_data(tb[TCA_DEF_PARMS]);
-        defdata = nla_data(tb[TCA_DEF_DATA]);
-        if (defdata == NULL)
+        if (tb[TCA_DEF_DATA] == NULL)
                 return -EINVAL;
 
-        datalen = nla_len(tb[TCA_DEF_DATA]);
-        if (datalen == 0)
-                return -EINVAL;
+        parm = nla_data(tb[TCA_DEF_PARMS]);
+        defdata = nla_data(tb[TCA_DEF_DATA]);
 
         pc = tcf_hash_check(parm->index, a, bind, &simp_hash_info);
         if (!pc) {
@@ -126,7 +124,7 @@ static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
                         return -ENOMEM;
 
                 d = to_defact(pc);
-                ret = alloc_defdata(d, datalen, defdata);
+                ret = alloc_defdata(d, defdata);
                 if (ret < 0) {
                         kfree(pc);
                         return ret;
@@ -138,7 +136,7 @@ static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
                         tcf_simp_release(d, bind);
                         return -EEXIST;
                 }
-                realloc_defdata(d, datalen, defdata);
+                realloc_defdata(d, defdata);
         }
 
         spin_lock_bh(&d->tcf_lock);
@@ -172,7 +170,7 @@ static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,
         opt.bindcnt = d->tcf_bindcnt - bind;
         opt.action = d->tcf_action;
         NLA_PUT(skb, TCA_DEF_PARMS, sizeof(opt), &opt);
-        NLA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);
+        NLA_PUT_STRING(skb, TCA_DEF_DATA, d->tcfd_defdata);
         t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install);
         t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse);
         t.expires = jiffies_to_clock_t(d->tcf_tm.expires);