From patchwork Thu Aug 5 10:19:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Coelho X-Patchwork-Id: 492633 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E507C432BE for ; Thu, 5 Aug 2021 10:19:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85E8861107 for ; Thu, 5 Aug 2021 10:19:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240277AbhHEKUD (ORCPT ); Thu, 5 Aug 2021 06:20:03 -0400 Received: from paleale.coelho.fi ([176.9.41.70]:51248 "EHLO farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S240232AbhHEKUA (ORCPT ); Thu, 5 Aug 2021 06:20:00 -0400 Received: from 91-156-6-193.elisa-laajakaista.fi ([91.156.6.193] helo=kveik.lan) by farmhouse.coelho.fi with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1mBaTY-00240Q-1c; Thu, 05 Aug 2021 13:19:45 +0300 From: Luca Coelho To: kvalo@codeaurora.org Cc: luca@coelho.fi, linux-wireless@vger.kernel.org Date: Thu, 5 Aug 2021 13:19:31 +0300 Message-Id: X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210805101934.431479-1-luca@coelho.fi> References: <20210805101934.431479-1-luca@coelho.fi> MIME-Version: 1.0 Subject: [PATCH 09/12] iwlwifi: mvm: fix access to BSS elements Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg BSS elements are protected using RCU, so we need to use RCU properly to access them, fix that. Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index c60c0b49d7f7..3a4585222d6d 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -2990,16 +2990,20 @@ static void iwl_mvm_check_he_obss_narrow_bw_ru_iter(struct wiphy *wiphy, void *_data) { struct iwl_mvm_he_obss_narrow_bw_ru_data *data = _data; + const struct cfg80211_bss_ies *ies; const struct element *elem; - elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, bss->ies->data, - bss->ies->len); + rcu_read_lock(); + ies = rcu_dereference(bss->ies); + elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, ies->data, + ies->len); if (!elem || elem->datalen < 10 || !(elem->data[10] & WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT)) { data->tolerated = false; } + rcu_read_unlock(); } static void iwl_mvm_check_he_obss_narrow_bw_ru(struct ieee80211_hw *hw,