From patchwork Thu Oct 19 15:31:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 736914 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 30D89CDB484 for ; Thu, 19 Oct 2023 15:33:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346294AbjJSPdA (ORCPT ); Thu, 19 Oct 2023 11:33:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345965AbjJSPc6 (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 C9465132; Thu, 19 Oct 2023 08:32:56 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F38EC433C7; 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=ybnrjlLviCjSD8GSKMljRyMDeDtfP4Uw7YCw85cfwvM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WPXJJ494N+eQZDwnrF5/v4p3ljxHkhrb79+NS63aMaP8W7GUKRqOqEEWUV/LreBag HTxotFRSHtLz/rFWarbLOJNw1T2cWLMnZdVQ335Hp2fEyrar9dvQO05e82mbwu5yKq DTjzRvqhCmIJWpe1BO4BmxWi5s8ogvv3+H5rjW/jO53qoFb6ZaVbwdMcZz7Z/p8Rws UQzf2yGkDD8Me+A2p5mgUwCArQEExqPnb85OvdAndNgu2aZjBRI1AvVW4JCOqHNYFq iUOofKwV48HRgk75KinzjO9cPqCR5y7YtmJ3e191nYLXKnfqUq/IwCffYcSxO7pzTy brbnGVQpzxGug== Received: from johan by xi.lan with local (Exim 4.96) (envelope-from ) id 1qtV1A-0006tA-0W; 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 1/2] wifi: ath11k: fix temperature event locking Date: Thu, 19 Oct 2023 17:31:14 +0200 Message-ID: <20231019153115.26401-2-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 temperature event handling code calling ath11k_mac_get_ar_by_pdev_id() was not marked as a read-side critical section as reported by RCU lockdep: ============================= WARNING: suspicious RCU usage 6.6.0-rc6 #7 Not tainted ----------------------------- drivers/net/wireless/ath/ath11k/mac.c:638 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by swapper/0/0. ... Call trace: ... lockdep_rcu_suspicious+0x16c/0x22c ath11k_mac_get_ar_by_pdev_id+0x194/0x1b0 [ath11k] ath11k_wmi_tlv_op_rx+0xa84/0x2c1c [ath11k] ath11k_htc_rx_completion_handler+0x388/0x510 [ath11k] Mark the code in question as an RCU read-side critical section to avoid any potential use-after-free issues. Fixes: a41d10348b01 ("ath11k: add thermal sensor device support") Cc: stable@vger.kernel.org # 5.7 Signed-off-by: Johan Hovold --- drivers/net/wireless/ath/ath11k/wmi.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c index 23ad6825e5be..da1582b8dc30 100644 --- a/drivers/net/wireless/ath/ath11k/wmi.c +++ b/drivers/net/wireless/ath/ath11k/wmi.c @@ -8383,14 +8383,17 @@ ath11k_wmi_pdev_temperature_event(struct ath11k_base *ab, ath11k_dbg(ab, ATH11K_DBG_WMI, "event pdev temperature ev temp %d pdev_id %d\n", ev->temp, ev->pdev_id); + rcu_read_lock(); + ar = ath11k_mac_get_ar_by_pdev_id(ab, ev->pdev_id); if (!ar) { ath11k_warn(ab, "invalid pdev id in pdev temperature ev %d", ev->pdev_id); - kfree(tb); - return; + goto exit; } ath11k_thermal_event_temperature(ar, ev->temp); +exit: + rcu_read_unlock(); kfree(tb); }