nl80211: Require auth type for NL80211_CMD_AUTHENTICATE

NL80211_ATTR_AUTH_TYPE is a required parameter for
NL80211_CMD_AUTHENTICATE. We are currently (by chance) defaulting to
open system authentication if the attribute is not specified. It is
better to just reject the invalid command.

Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 2f449ddcbc725c64947498224d01135d92e23a08..c04df6a6af78773040f772d877aca016091b5662 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2752,6 +2752,9 @@ static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
        if (!info->attrs[NL80211_ATTR_MAC])
                return -EINVAL;
 
+       if (!info->attrs[NL80211_ATTR_AUTH_TYPE])
+               return -EINVAL;
+
        rtnl_lock();
 
        err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
@@ -2798,13 +2801,10 @@ static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
                req.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
        }
 
-       if (info->attrs[NL80211_ATTR_AUTH_TYPE]) {
-               req.auth_type =
-                       nla_get_u32(info->attrs[NL80211_ATTR_AUTH_TYPE]);
-               if (!nl80211_valid_auth_type(req.auth_type)) {
-                       err = -EINVAL;
-                       goto out;
-               }
+       req.auth_type = nla_get_u32(info->attrs[NL80211_ATTR_AUTH_TYPE]);
+       if (!nl80211_valid_auth_type(req.auth_type)) {
+               err = -EINVAL;
+               goto out;
        }
 
        err = drv->ops->auth(&drv->wiphy, dev, &req);