From mboxrd@z Thu Jan 1 00:00:00 1970 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 70016C43217 for ; Mon, 30 May 2022 14:47:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241910AbiE3Ope (ORCPT ); Mon, 30 May 2022 10:45:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241552AbiE3OXU (ORCPT ); Mon, 30 May 2022 10:23:20 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8026412B007; Mon, 30 May 2022 06:50:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8EE4B61034; Mon, 30 May 2022 13:50:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7306C3411E; Mon, 30 May 2022 13:50:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1653918641; bh=zZ8Ny6isuJgovwiWB2jimRYvq29LtKT6NbIjjiWAd9U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aVUemRt3czYNmOBoWFZr2w7dDCx4dVGVwukHyR8D2ccPdzCfa1nAm58IuFmlfX9BW n1T2qlIGYAEOMW92QOd4ZQ8xVh8nc5sodgT4V1/vy4G8eshgvXh3JjTcx1A9PKcAqy g+waqt4J6bLRjCL7CA5mypCIv2jCDKTERC9NxBp/pk/XvdJky9PwjeLXNDnItTCfP0 /O7FzYZsaV2YAawyqdRTMljfFIpwuHJ4zP3T5ho75eM8UzzmyhGE8VsnJTWFCG9Lgv kR60/gPjGyavGrc8ImjsRCX/MONLAEiQTDr641pp+lRP91MxRJ7cGWgtlLMJv88nL+ VN+oya6kBSM/w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lin Ma , Mark Brown , Sasha Levin , oder_chiou@realtek.com, lgirdwood@gmail.com, perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org Subject: [PATCH AUTOSEL 4.19 32/38] ASoC: rt5645: Fix errorenous cleanup order Date: Mon, 30 May 2022 09:49:18 -0400 Message-Id: <20220530134924.1936816-32-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220530134924.1936816-1-sashal@kernel.org> References: <20220530134924.1936816-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lin Ma [ Upstream commit 2def44d3aec59e38d2701c568d65540783f90f2f ] There is a logic error when removing rt5645 device as the function rt5645_i2c_remove() first cancel the &rt5645->jack_detect_work and delete the &rt5645->btn_check_timer latter. However, since the timer handler rt5645_btn_check_callback() will re-queue the jack_detect_work, this cleanup order is buggy. That is, once the del_timer_sync in rt5645_i2c_remove is concurrently run with the rt5645_btn_check_callback, the canceled jack_detect_work will be rescheduled again, leading to possible use-after-free. This patch fix the issue by placing the del_timer_sync function before the cancel_delayed_work_sync. Signed-off-by: Lin Ma Link: https://lore.kernel.org/r/20220516092035.28283-1-linma@zju.edu.cn Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/codecs/rt5645.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c index 9185bd7c5a6d..d34000182f67 100644 --- a/sound/soc/codecs/rt5645.c +++ b/sound/soc/codecs/rt5645.c @@ -4105,9 +4105,14 @@ static int rt5645_i2c_remove(struct i2c_client *i2c) if (i2c->irq) free_irq(i2c->irq, rt5645); + /* + * Since the rt5645_btn_check_callback() can queue jack_detect_work, + * the timer need to be delted first + */ + del_timer_sync(&rt5645->btn_check_timer); + cancel_delayed_work_sync(&rt5645->jack_detect_work); cancel_delayed_work_sync(&rt5645->rcclock_work); - del_timer_sync(&rt5645->btn_check_timer); regulator_bulk_disable(ARRAY_SIZE(rt5645->supplies), rt5645->supplies); -- 2.35.1