cfg80211: More error messages for key addition failures

These were helpful while working with extensions to NL80211_CMD_NEW_KEY,
so add more explicit error reporting for additional cases that can fail
while that command is being processed.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Link: https://lore.kernel.org/r/20200222132548.20835-1-jouni@codeaurora.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d795552..ce55a2c 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3978,8 +3978,10 @@ static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
        if (err)
                return err;
 
-       if (!key.p.key)
+       if (!key.p.key) {
+               GENL_SET_ERR_MSG(info, "no key");
                return -EINVAL;
+       }
 
        if (info->attrs[NL80211_ATTR_MAC])
                mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
@@ -3993,8 +3995,10 @@ static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
 
        /* for now */
        if (key.type != NL80211_KEYTYPE_PAIRWISE &&
-           key.type != NL80211_KEYTYPE_GROUP)
+           key.type != NL80211_KEYTYPE_GROUP) {
+               GENL_SET_ERR_MSG(info, "key type not pairwise or group");
                return -EINVAL;
+       }
 
        if (key.type == NL80211_KEYTYPE_GROUP &&
            info->attrs[NL80211_ATTR_VLAN_ID])
@@ -4005,15 +4009,22 @@ static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
 
        if (cfg80211_validate_key_settings(rdev, &key.p, key.idx,
                                           key.type == NL80211_KEYTYPE_PAIRWISE,
-                                          mac_addr))
+                                          mac_addr)) {
+               GENL_SET_ERR_MSG(info, "key setting validation failed");
                return -EINVAL;
+       }
 
        wdev_lock(dev->ieee80211_ptr);
        err = nl80211_key_allowed(dev->ieee80211_ptr);
-       if (!err)
+       if (err)
+               GENL_SET_ERR_MSG(info, "key not allowed");
+       if (!err) {
                err = rdev_add_key(rdev, dev, key.idx,
                                   key.type == NL80211_KEYTYPE_PAIRWISE,
                                    mac_addr, &key.p);
+               if (err)
+                       GENL_SET_ERR_MSG(info, "key addition failed");
+       }
        wdev_unlock(dev->ieee80211_ptr);
 
        return err;