From 496fcc294daab18799e190c0264863d653588d1f Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 12 Mar 2015 08:53:27 +0200 Subject: [PATCH] nl80211: ignore HT/VHT capabilities without QoS/WMM As HT/VHT depend heavily on QoS/WMM, it's not a good idea to let userspace add clients that have HT/VHT but not QoS/WMM. Since it does so in certain cases we've observed (client is using HT IEs but not QoS/WMM) just ignore the HT/VHT info at this point and don't pass it down to the drivers which might unconditionally use it. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg --- net/wireless/nl80211.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index be2501538011..b6f84f6a2a09 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -4400,6 +4400,16 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) if (parse_station_flags(info, dev->ieee80211_ptr->iftype, ¶ms)) return -EINVAL; + /* HT/VHT requires QoS, but if we don't have that just ignore HT/VHT + * as userspace might just pass through the capabilities from the IEs + * directly, rather than enforcing this restriction and returning an + * error in this case. + */ + if (!(params.sta_flags_set & BIT(NL80211_STA_FLAG_WME))) { + params.ht_capa = NULL; + params.vht_capa = NULL; + } + /* When you run into this, adjust the code below for the new flag */ BUILD_BUG_ON(NL80211_STA_FLAG_MAX != 7); -- 2.34.1