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,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 61675C43331 for ; Sun, 10 Nov 2019 02:45:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3180E21850 for ; Sun, 10 Nov 2019 02:45:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573353951; bh=6zIYvAQLeAqmRqLZCnOGn1hGP8lmOux0Wh75nSABTTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GNWVaxF+en6S7cGs+wLgOg1R4hODPrY+2aBvKHHZoAJXqGZgkiutKhBdS8nxzJRay SeBTmFRJ9IP1INgQ1U5Nq1N0lixa3oDrnfTifDfzL8w2OOhrTwcU9MOMN23Fy4iDKY PKXOAO2pmSAcPCCAmkguuf5EiVetzhEseiDkaxaU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728918AbfKJCpt (ORCPT ); Sat, 9 Nov 2019 21:45:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:46522 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728788AbfKJCpU (ORCPT ); Sat, 9 Nov 2019 21:45:20 -0500 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 DC388222BE; Sun, 10 Nov 2019 02:45:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573353919; bh=6zIYvAQLeAqmRqLZCnOGn1hGP8lmOux0Wh75nSABTTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=isbFdRsoULsWqnRqnukhJf5Y2YP710nsKXd3zs+1YUabLu+RYjqiqI4OjoJErJsT7 E/SsXg09h+220/pu7SIw59KGUzWhcRdhcpeGKbyS9mkFlpc+hQA7jPwQ449qsaCOb9 MfJkrJzIXaWVYrKwKtIvyVD9j8O39ZIkRT6BDUfw= 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 4.19 182/191] rtc: armada38x: fix possible race condition Date: Sat, 9 Nov 2019 21:40:04 -0500 Message-Id: <20191110024013.29782-182-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191110024013.29782-1-sashal@kernel.org> References: <20191110024013.29782-1-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 7d61cbb945a753af08e247b5f10bdd5dbb8d6c80 ] The IRQ is requested before the struct rtc is allocated and registered, but this struct is used in the IRQ handler. This may lead to a NULL pointer dereference. Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc before requesting the IRQ. Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/rtc/rtc-armada38x.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/rtc/rtc-armada38x.c b/drivers/rtc/rtc-armada38x.c index bde53c8ccee2c..b74338d6dde60 100644 --- a/drivers/rtc/rtc-armada38x.c +++ b/drivers/rtc/rtc-armada38x.c @@ -514,7 +514,6 @@ MODULE_DEVICE_TABLE(of, armada38x_rtc_of_match_table); static __init int armada38x_rtc_probe(struct platform_device *pdev) { - const struct rtc_class_ops *ops; struct resource *res; struct armada38x_rtc *rtc; const struct of_device_id *match; @@ -551,6 +550,11 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev) dev_err(&pdev->dev, "no irq\n"); return rtc->irq; } + + rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(rtc->rtc_dev)) + return PTR_ERR(rtc->rtc_dev); + if (devm_request_irq(&pdev->dev, rtc->irq, armada38x_rtc_alarm_irq, 0, pdev->name, rtc) < 0) { dev_warn(&pdev->dev, "Interrupt not available.\n"); @@ -560,28 +564,24 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev) if (rtc->irq != -1) { device_init_wakeup(&pdev->dev, 1); - ops = &armada38x_rtc_ops; + rtc->rtc_dev->ops = &armada38x_rtc_ops; } else { /* * If there is no interrupt available then we can't * use the alarm */ - ops = &armada38x_rtc_ops_noirq; + rtc->rtc_dev->ops = &armada38x_rtc_ops_noirq; } rtc->data = (struct armada38x_rtc_data *)match->data; - /* Update RTC-MBUS bridge timing parameters */ rtc->data->update_mbus_timing(rtc); - rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name, - ops, THIS_MODULE); - if (IS_ERR(rtc->rtc_dev)) { - ret = PTR_ERR(rtc->rtc_dev); + ret = rtc_register_device(rtc->rtc_dev); + if (ret) dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); - return ret; - } - return 0; + + return ret; } #ifdef CONFIG_PM_SLEEP -- 2.20.1