net_cls_act: act_simple dont ignore realloc code

reallocation of the policy data was being ignored. It could fail.
Simplify so that there is no need for reallocating.

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

net/sched/act_simple.c

@@ -79,10 +79,14 @@ static int alloc_defdata(struct tcf_defact *d, char *defdata)
 	return 0;
 }
 
-static int realloc_defdata(struct tcf_defact *d, char *defdata)
+static void reset_policy(struct tcf_defact *d, char *defdata,
+			 struct tc_defact *p)
 {
-	kfree(d->tcfd_defdata);
-	return alloc_defdata(d, defdata);
+	spin_lock_bh(&d->tcf_lock);
+	d->tcf_action = p->action;
+	memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
+	strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
+	spin_unlock_bh(&d->tcf_lock);
 }
 
 static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = {
@@ -129,20 +133,17 @@ static int tcf_simp_init(struct nlattr *nla, struct nlattr *est,
 			kfree(pc);
 			return ret;
 		}
+		d->tcf_action = parm->action;
 		ret = ACT_P_CREATED;
 	} else {
 		d = to_defact(pc);
 		if (!ovr) {
 			tcf_simp_release(d, bind);
 			return -EEXIST;
 		}
-		realloc_defdata(d, defdata);
+		reset_policy(d, defdata, parm);
 	}
 
-	spin_lock_bh(&d->tcf_lock);
-	d->tcf_action = parm->action;
-	spin_unlock_bh(&d->tcf_lock);
-
 	if (ret == ACT_P_CREATED)
 		tcf_hash_insert(pc, &simp_hash_info);
 	return ret;