From patchwork Thu Oct 19 15:31:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 13429384 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45808C41513 for ; Thu, 19 Oct 2023 15:32:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346239AbjJSPc6 (ORCPT ); Thu, 19 Oct 2023 11:32:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345747AbjJSPc6 (ORCPT ); Thu, 19 Oct 2023 11:32:58 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD24312F; Thu, 19 Oct 2023 08:32:56 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6655CC433C8; Thu, 19 Oct 2023 15:32:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697729576; bh=JmxVPCdruKLMQZ5RUKgTCknlS6N8U4MPq35+pkolZUQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=POBMJg19qSQ8erDJJsBUAf4QYH8J8D1C98PNUaEeDBax10sfUqooXE+3ZKs22bFFx Tg9fXsoNI6LSy/j0et+lzIy5ceQrs4BsPjQwjk6tD+nHsf2hGul/MyaheRNwH/wszt xHYnJlyz6oQmakAfMzDckwV0XWI316CcWj3YbngQAeHnep2LSdzgNys2eLGFEu5KNM HddIU7Bp2dEJECPMzwA191ONt1VSdxObTlvZ+T1OKmQWSXiA7A6TOvMFzR4bwLKq8l or2NE7fzpEJnHxWyFEMg+AOLSbqyFlZjJejvqN1n0klNmtRYMy+tSULs0BB/IKbE4I Zwz+s+1Czk0Aw== Received: from johan by xi.lan with local (Exim 4.96) (envelope-from ) id 1qtV1A-0006tC-0o; Thu, 19 Oct 2023 17:33:00 +0200 From: Johan Hovold To: Kalle Valo Cc: Jeff Johnson , ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org Subject: [PATCH v2 2/2] wifi: ath11k: fix dfs radar event locking Date: Thu, 19 Oct 2023 17:31:15 +0200 Message-ID: <20231019153115.26401-3-johan+linaro@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231019153115.26401-1-johan+linaro@kernel.org> References: <20231019153115.26401-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The ath11k active pdevs are protected by RCU but the DFS radar event handling code calling ath11k_mac_get_ar_by_pdev_id() was not marked as a read-side critical section. Mark the code in question as an RCU read-side critical section to avoid any potential use-after-free issues. Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") Cc: stable@vger.kernel.org # 5.6 Acked-by: Jeff Johnson Signed-off-by: Johan Hovold --- drivers/net/wireless/ath/ath11k/wmi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c index da1582b8dc30..f0eac6cb84fd 100644 --- a/drivers/net/wireless/ath/ath11k/wmi.c +++ b/drivers/net/wireless/ath/ath11k/wmi.c @@ -8337,6 +8337,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event(struct ath11k_base *ab, struct sk_buff ev->detector_id, ev->segment_id, ev->timestamp, ev->is_chirp, ev->freq_offset, ev->sidx); + rcu_read_lock(); + ar = ath11k_mac_get_ar_by_pdev_id(ab, ev->pdev_id); if (!ar) { @@ -8354,6 +8356,8 @@ ath11k_wmi_pdev_dfs_radar_detected_event(struct ath11k_base *ab, struct sk_buff ieee80211_radar_detected(ar->hw); exit: + rcu_read_unlock(); + kfree(tb); }