From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754837AbbDGNCy (ORCPT ); Tue, 7 Apr 2015 09:02:54 -0400 Received: from ip4-83-240-67-251.cust.nbox.cz ([83.240.67.251]:54363 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753740AbbDGMwP (ORCPT ); Tue, 7 Apr 2015 08:52:15 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Johannes Berg , Jiri Slaby Subject: [PATCH 3.12 147/155] nl80211: ignore HT/VHT capabilities without QoS/WMM Date: Tue, 7 Apr 2015 14:51:56 +0200 Message-Id: <5ebbb95cc7fbf91bf8472371f99e659a5a8b575f.1428411004.git.jslaby@suse.cz> X-Mailer: git-send-email 2.3.4 In-Reply-To: <9a548862b8a26cbccc14f2c6c9c3688813d8d14b.1428411003.git.jslaby@suse.cz> References: <9a548862b8a26cbccc14f2c6c9c3688813d8d14b.1428411003.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johannes Berg 3.12-stable 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 Signed-off-by: Jiri Slaby --- net/wireless/nl80211.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 388123667f1e..79c3e641581d 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -4096,6 +4096,16 @@ 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); -- 2.3.4