netlink: set bad attribute also on maxtype check

The check that attribute type is within 0...maxtype range in
__nla_validate_parse() sets only error message but not bad_attr in extack.
Set also bad_attr to tell userspace which attribute failed validation.
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

lib/nlattr.c

@@ -356,7 +356,8 @@ static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype,
 
 		if (type == 0 || type > maxtype) {
 			if (validate & NL_VALIDATE_MAXTYPE) {
-				NL_SET_ERR_MSG(extack, "Unknown attribute type");
+				NL_SET_ERR_MSG_ATTR(extack, nla,
+						    "Unknown attribute type");
 				return -EINVAL;
 			}
 			continue;