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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 B68C9C2BA19 for ; Wed, 15 Apr 2020 11:59:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 985CB2078A for ; Wed, 15 Apr 2020 11:59:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586951948; bh=I2uUxjHtJ2Bl5V9iG8w5PAC575AFfnuGItHBb/Skifc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0FydGhxwaG1UYydtP7/buAIIQNW4M8MYu6Kd1MPgI/jyW2qJ/uuTaihLlbDpLk4Mx d6RwIXmtHcOgokwSEK4jaix4s8wjYbK4qrixxxJLulmx+pOvpu3k4XBQHKfonFx6hy gQGr6aANRs7xHBgSVAl+mRDHx0y/Ir6iTCDY6HnE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409688AbgDOL5n (ORCPT ); Wed, 15 Apr 2020 07:57:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:41484 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409292AbgDOLqa (ORCPT ); Wed, 15 Apr 2020 07:46:30 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 440C02168B; Wed, 15 Apr 2020 11:46:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586951189; bh=I2uUxjHtJ2Bl5V9iG8w5PAC575AFfnuGItHBb/Skifc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uaHL17L0A7CvIMMRHVtXGGwju6/KNqLnYKmxWuEYeCLntzr45XapkW5hoACSmxU5+ CiY6+IvRCmA4O/zhBCY/rZPbRWUxvWQT6wG3EMfa30BjuS688lKZzD3KxQcJ3TNyn7 ut+5CugqKWVq7pG8aSJqAgqmJ6wHCNP8ESP4FOvM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alexandre Belloni , Sasha Levin , linux-rtc@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 05/40] rtc: 88pm860x: fix possible race condition Date: Wed, 15 Apr 2020 07:45:48 -0400 Message-Id: <20200415114623.14972-5-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200415114623.14972-1-sashal@kernel.org> References: <20200415114623.14972-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexandre Belloni [ Upstream commit 9cf4789e6e4673d0b2c96fa6bb0c35e81b43111a ] The RTC IRQ is requested before the struct rtc_device is allocated, this may lead to a NULL pointer dereference in the IRQ handler. To fix this issue, allocating the rtc_device struct before requesting the RTC IRQ using devm_rtc_allocate_device, and use rtc_register_device to register the RTC device. Also remove the unnecessary error message as the core already prints the info. Link: https://lore.kernel.org/r/20200311223956.51352-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/rtc/rtc-88pm860x.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/rtc/rtc-88pm860x.c b/drivers/rtc/rtc-88pm860x.c index 73697e4b18a9d..9d4a59aa29a1a 100644 --- a/drivers/rtc/rtc-88pm860x.c +++ b/drivers/rtc/rtc-88pm860x.c @@ -341,6 +341,10 @@ static int pm860x_rtc_probe(struct platform_device *pdev) info->dev = &pdev->dev; dev_set_drvdata(&pdev->dev, info); + info->rtc_dev = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(info->rtc_dev)) + return PTR_ERR(info->rtc_dev); + ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, rtc_update_handler, IRQF_ONESHOT, "rtc", info); @@ -382,13 +386,11 @@ static int pm860x_rtc_probe(struct platform_device *pdev) } } - info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm860x-rtc", - &pm860x_rtc_ops, THIS_MODULE); - ret = PTR_ERR(info->rtc_dev); - if (IS_ERR(info->rtc_dev)) { - dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); + info->rtc_dev->ops = &pm860x_rtc_ops; + + ret = rtc_register_device(info->rtc_dev); + if (ret) return ret; - } /* * enable internal XO instead of internal 3.25MHz clock since it can -- 2.20.1