From patchwork Fri Feb 12 02:13:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuah Khan X-Patchwork-Id: 12084633 X-Patchwork-Delegate: kvalo@adurom.com 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=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 A8E20C433DB for ; Fri, 12 Feb 2021 02:14:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E26E64E39 for ; Fri, 12 Feb 2021 02:14:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229929AbhBLCOi (ORCPT ); Thu, 11 Feb 2021 21:14:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229662AbhBLCOe (ORCPT ); Thu, 11 Feb 2021 21:14:34 -0500 Received: from mail-il1-x131.google.com (mail-il1-x131.google.com [IPv6:2607:f8b0:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC039C061793 for ; Thu, 11 Feb 2021 18:13:15 -0800 (PST) Received: by mail-il1-x131.google.com with SMTP id z18so6959160ile.9 for ; Thu, 11 Feb 2021 18:13:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=qveShMPbHGycDxVnezPtmezGFQ5w3ZTyOuDm3wEWy/E=; b=BgsaW5E7Kw179DCPLiLzHyN/ro+XOZBcGO3kdMekpOhC0bu+wxZwr3WSDw08Ysyl/n MIwsUB7tOx3lKnOuNp9F7pvmH0qJYoW/ox7xlor9urol+/RO5HhEYKuMLUS2+x7zkQxy 9wWznb1ZZ/vP0IWWDJE+qqZAi5vwSPt9/D76U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=qveShMPbHGycDxVnezPtmezGFQ5w3ZTyOuDm3wEWy/E=; b=INXuEbDSrtJGrx5RNYcYacfzOTCVS0HA6d4alIzqFQVCesZje1XF/c7f1xNsvXYeO9 7L3vzs+buD6rEHHoDSmd2qfcSPOTPIQTZptR1uHJpnNRq8h4FCkuLCNt3bTORIxiriBe L5cIQ5CRTDg4J7xdSWEyPlSR16NuECLSg+6MLjv7JY0QwvhfBhmaRLDLN7KCi72LsBxV 6oBr618ly8qYmxU7gNG8MiPWMt45g8RkEZ16WdeRdcxfiizor6RwQ4Ng/D2qCNKw4W3T Pl0rw2RDelMrb0b5df+O26zh/Cvd9Op8gu0FFyMPfsh1uEP4wBUQ7zGz9xhjYvoejzAW C+xg== X-Gm-Message-State: AOAM532BqPtD1HoKy5APYPslNYGT8c8OvgCQUAnG34ZjmRdlBE1Tra3Z m5IFQb8aONh8YlLa8oRNMFlLWw== X-Google-Smtp-Source: ABdhPJyhvcl4RxwVh/698ob0IjP+vOrAdjty3JRXeczY0MhpBo6e7qMZZCbCiAsJp/eRHkxwJtuw0Q== X-Received: by 2002:a92:b510:: with SMTP id f16mr755085ile.22.1613095995313; Thu, 11 Feb 2021 18:13:15 -0800 (PST) Received: from shuah-t480s.internal (c-24-9-64-241.hsd1.co.comcast.net. [24.9.64.241]) by smtp.gmail.com with ESMTPSA id c2sm3480594ilk.32.2021.02.11.18.13.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Feb 2021 18:13:14 -0800 (PST) From: Shuah Khan To: tony0620emma@gmail.com, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Cc: Shuah Khan , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] rtw88: hold RCU lock when calling ieee80211_find_sta_by_ifaddr() Date: Thu, 11 Feb 2021 19:13:07 -0700 Message-Id: <20210212021312.40486-2-skhan@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <1cfa036227cfa9fdd04316c01e1d754f13a70d9e.1613090339.git.skhan@linuxfoundation.org> References: <1cfa036227cfa9fdd04316c01e1d754f13a70d9e.1613090339.git.skhan@linuxfoundation.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org ieee80211_find_sta_by_ifaddr() must be called under the RCU lock and the resulting pointer is only valid under RCU lock as well. Fix rtw_rx_addr_match_iter() to hold RCU read lock before it calls ieee80211_find_sta_by_ifaddr() and release it when the resulting pointer is no longer needed. This problem was found while reviewing code to debug RCU warn from ath10k_wmi_tlv_parse_peer_stats_info() and a subsequent manual audit of other callers of ieee80211_find_sta_by_ifaddr() that don't hold RCU read lock. Signed-off-by: Shuah Khan --- - Note: This patch is compile tested. I don't have access to hardware. drivers/net/wireless/realtek/rtw88/rx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/realtek/rtw88/rx.c b/drivers/net/wireless/realtek/rtw88/rx.c index 7087e385a9b3..4ab3d3e2bfab 100644 --- a/drivers/net/wireless/realtek/rtw88/rx.c +++ b/drivers/net/wireless/realtek/rtw88/rx.c @@ -111,6 +111,9 @@ static void rtw_rx_addr_match_iter(void *data, u8 *mac, return; rtw_rx_phy_stat(rtwdev, pkt_stat, hdr); + + rcu_read_lock(); + sta = ieee80211_find_sta_by_ifaddr(rtwdev->hw, hdr->addr2, vif->addr); if (!sta) @@ -118,6 +121,9 @@ static void rtw_rx_addr_match_iter(void *data, u8 *mac, si = (struct rtw_sta_info *)sta->drv_priv; ewma_rssi_add(&si->avg_rssi, pkt_stat->rssi); + +exit: + rcu_read_unlock(); } static void rtw_rx_addr_match(struct rtw_dev *rtwdev,