linux-kernel - [PATCH 3.4 119/172] nl80211: ignore HT/VHT capabilities without QoS/WMM

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Date:	Tue, 16 Jun 2015 16:36:13 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Johannes Berg <johannes.berg@...el.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 119/172] nl80211: ignore HT/VHT capabilities without QoS/WMM

From: Johannes Berg <johannes.berg@...el.com>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


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 <johannes.berg@...el.com>
[lizf: Backported to 3.4:
 - adjust context
 - 3.4 doesn't support VHT]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 net/wireless/nl80211.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 63c1807..263cbd8 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2810,6 +2810,14 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
 	if (parse_station_flags(info, dev->ieee80211_ptr->iftype, &params))
 		return -EINVAL;
 
+	/* HT 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;
+
 	switch (dev->ieee80211_ptr->iftype) {
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_AP_VLAN:
-- 
1.9.1

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