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 63543C2BA19 for ; Wed, 15 Apr 2020 12:29:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3891E20936 for ; Wed, 15 Apr 2020 12:29:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586953765; bh=0rcL6w+U3QxTPUxJYsUdrnHmbxHPVlcjvRNL/c8lbPI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=myafYaVsIhXYLAcu1wdAuGl1gqORAPULA7ngloIvjqorGg4728wq+BILYBKYQ36rH Z4Kffvh5MzS4dLMBd+FktgUtjUS5ah7J931NwHggvUi0qUm0yliGwcq/lKo0kLuqvY pj2wibcFptelMmef4wit/khAeyqMl4CtB9R2pUtI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S369396AbgDOM3W (ORCPT ); Wed, 15 Apr 2020 08:29:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:38110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409119AbgDOLpC (ORCPT ); Wed, 15 Apr 2020 07:45:02 -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 764AE20775; Wed, 15 Apr 2020 11:45:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586951101; bh=0rcL6w+U3QxTPUxJYsUdrnHmbxHPVlcjvRNL/c8lbPI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lzVUNWGqa6nxWznGCYJkSW3V90OO15gGSYqAZm+MoGym+Ig3Cd+jmIGWmIRZyMAPn t+Eo8yOgw7GxJXGSJity72gzHpE//y9MrOrve9pMXncVpCaVeWGGjHcJHYklVmsiCM AtuXAFweGFwk+IQ/mYKbfXEllbz467ESGCL7i/7Y= 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 5.4 16/84] rtc: 88pm860x: fix possible race condition Date: Wed, 15 Apr 2020 07:43:33 -0400 Message-Id: <20200415114442.14166-16-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200415114442.14166-1-sashal@kernel.org> References: <20200415114442.14166-1-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 4743b16a8d849..1526402e126b2 100644 --- a/drivers/rtc/rtc-88pm860x.c +++ b/drivers/rtc/rtc-88pm860x.c @@ -336,6 +336,10 @@ 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); @@ -377,13 +381,11 @@ 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