diff options
| author | Johannes Berg | 2022-07-06 15:31:55 +0200 |
|---|---|---|
| committer | Johannes Berg | 2022-07-15 11:43:19 +0200 |
| commit | efbfe5165e5dd353343af47199e0ee0dba139aed (patch) | |
| tree | c27e649cf037483b7cc65b1cba1598afc62e2d15 /net/wireless | |
| parent | d3e2439b0f339de319d27118f6de365753081179 (diff) | |
wifi: nl80211: better validate link ID for stations
If we add a station on an MLD, we need a link ID to see
where it lives (by default). Validate the link ID against
the valid_links.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/nl80211.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index d774e9a95492..37ec8b3897b4 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -6991,6 +6991,7 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) struct cfg80211_registered_device *rdev = info->user_ptr[0]; int err; struct net_device *dev = info->user_ptr[1]; + struct wireless_dev *wdev = dev->ieee80211_ptr; struct station_parameters params; u8 *mac_addr = NULL; u32 auth_assoc = BIT(NL80211_STA_FLAG_AUTHENTICATED) | @@ -7018,14 +7019,6 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) nl80211_link_id_or_invalid(info->attrs); if (info->attrs[NL80211_ATTR_MLD_ADDR]) { - /* If MLD_ADDR attribute is set then this is an MLD station - * and the MLD_ADDR attribute holds the MLD address and the - * MAC attribute holds for the LINK address. - * In that case, the link_id is also expected to be valid. - */ - if (params.link_sta_params.link_id < 0) - return -EINVAL; - mac_addr = nla_data(info->attrs[NL80211_ATTR_MLD_ADDR]); params.link_sta_params.mld_mac = mac_addr; params.link_sta_params.link_mac = @@ -7253,9 +7246,24 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) /* be aware of params.vlan when changing code here */ wdev_lock(dev->ieee80211_ptr); + if (wdev->valid_links) { + if (params.link_sta_params.link_id < 0) { + err = -EINVAL; + goto out; + } + if (!(wdev->valid_links & BIT(params.link_sta_params.link_id))) { + err = -ENOLINK; + goto out; + } + } else { + if (params.link_sta_params.link_id >= 0) { + err = -EINVAL; + goto out; + } + } err = rdev_add_station(rdev, dev, mac_addr, ¶ms); +out: wdev_unlock(dev->ieee80211_ptr); - dev_put(params.vlan); return err; } |