[NETFILTER]: Convert arp_tables targets to centralized error checking

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

net/ipv4/netfilter/arp_tables.c

@@ -1143,11 +1143,13 @@ void arpt_unregister_table(struct arpt_table *table)
 /* The built-in targets: standard (NULL) and error. */
 static struct arpt_target arpt_standard_target = {
 	.name		= ARPT_STANDARD_TARGET,
+	.targetsize	= sizeof(int),
 };
 
 static struct arpt_target arpt_error_target = {
 	.name		= ARPT_ERROR_TARGET,
 	.target		= arpt_error,
+	.targetsize	= ARPT_FUNCTION_MAXNAMELEN,
 };
 
 static struct nf_sockopt_ops arpt_sockopts = {

net/ipv4/netfilter/arpt_mangle.c

@@ -80,10 +80,10 @@ checkentry(const char *tablename, const void *e, void *targinfo,
 	return 1;
 }
 
-static struct arpt_target arpt_mangle_reg
-= {
+static struct arpt_target arpt_mangle_reg = {
 	.name		= "mangle",
 	.target		= target,
+	.targetsize	= sizeof(struct arpt_mangle),
 	.checkentry	= checkentry,
 	.me		= THIS_MODULE,
 };