From: Johannes Berg Date: Thu, 12 Mar 2015 06:53:27 +0000 (+0200) Subject: nl80211: ignore HT/VHT capabilities without QoS/WMM X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9de9cea31095afa68b5eaa3030c4a2969a59e963;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git nl80211: ignore HT/VHT capabilities without QoS/WMM commit 496fcc294daab18799e190c0264863d653588d1f upstream. 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. Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index dc200bf831ae..90a0e552cb32 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -4032,6 +4032,16 @@ 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);