[NETFILTER]: arp_tables: move counter allocation to seperate function

More resyncing with ip_tables.c as preparation for compat support.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/arp_tables.c

@@ -706,16 +706,11 @@ static void get_counters(const struct xt_table_info *t,
 	}
 }
 
-static int copy_entries_to_user(unsigned int total_size,
-				struct arpt_table *table,
-				void __user *userptr)
+static inline struct xt_counters *alloc_counters(struct arpt_table *table)
 {
-	unsigned int off, num, countersize;
-	struct arpt_entry *e;
+	unsigned int countersize;
 	struct xt_counters *counters;
 	struct xt_table_info *private = table->private;
-	int ret = 0;
-	void *loc_cpu_entry;
 
 	/* We need atomic snapshot of counters: rest doesn't change
 	 * (other than comefrom, which userspace doesn't care
@@ -725,13 +720,31 @@ static int copy_entries_to_user(unsigned int total_size,
 	counters = vmalloc_node(countersize, numa_node_id());
 
 	if (counters == NULL)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	/* First, sum counters... */
 	write_lock_bh(&table->lock);
 	get_counters(private, counters);
 	write_unlock_bh(&table->lock);
 
+	return counters;
+}
+
+static int copy_entries_to_user(unsigned int total_size,
+				struct arpt_table *table,
+				void __user *userptr)
+{
+	unsigned int off, num;
+	struct arpt_entry *e;
+	struct xt_counters *counters;
+	struct xt_table_info *private = table->private;
+	int ret = 0;
+	void *loc_cpu_entry;
+
+	counters = alloc_counters(table);
+	if (IS_ERR(counters))
+		return PTR_ERR(counters);
+
 	loc_cpu_entry = private->entries[raw_smp_processor_id()];
 	/* ... then copy entire thing ... */
 	if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {