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=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 5926BFA372C for ; Fri, 8 Nov 2019 12:06:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 31CC721848 for ; Fri, 8 Nov 2019 12:06:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573214819; bh=DgnMDlLLXfeQeKctRy7xaYZdYGgwE1jsdDjdNnqBmGA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wvYScqwdHEvfRiVFNPXF6i8u3juuMTq9BV1lWd451/ObRSZFjutmSu5B6dL83elhz 6+mFcT4S213waKLIgMY7PZVYtqeqv+XU3rzlSlHK67hqVEyk4U9nRzovzFxU4DRj2y CWp5HtcY0Hgc1Moacx1nNbkzF2hQd+M3ykmTD7ss= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388979AbfKHMG5 (ORCPT ); Fri, 8 Nov 2019 07:06:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:54158 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389109AbfKHLlC (ORCPT ); Fri, 8 Nov 2019 06:41:02 -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 35D43222C2; Fri, 8 Nov 2019 11:41:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573213261; bh=DgnMDlLLXfeQeKctRy7xaYZdYGgwE1jsdDjdNnqBmGA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RMCjkmWK4PvLzh0xKnoY12cipaF9d+8w5f7KpNxDbaRpZlT88MW5llmjJk6/DuHkP lurQg/UtSjDi0Q2c4V7zezxzdo3m4mVHREKTOuLiwQz9stUQhFrznossNdVFGZ1MNI XzYkVlM2q64TYktHcocS9PSbi9ZQMndZKfY3GdZQ= 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 4.19 126/205] rtc: pl030: fix possible race condition Date: Fri, 8 Nov 2019 06:36:33 -0500 Message-Id: <20191108113752.12502-126-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191108113752.12502-1-sashal@kernel.org> References: <20191108113752.12502-1-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 c778ec85825dc895936940072aea9fe9037db684 ] 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-pl030.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/rtc/rtc-pl030.c b/drivers/rtc/rtc-pl030.c index f85a1a93e669f..343bb6ed17839 100644 --- a/drivers/rtc/rtc-pl030.c +++ b/drivers/rtc/rtc-pl030.c @@ -112,6 +112,13 @@ static int pl030_probe(struct amba_device *dev, const struct amba_id *id) goto err_rtc; } + rtc->rtc = devm_rtc_allocate_device(&dev->dev); + if (IS_ERR(rtc->rtc)) { + ret = PTR_ERR(rtc->rtc); + goto err_rtc; + } + + rtc->rtc->ops = &pl030_ops; rtc->base = ioremap(dev->res.start, resource_size(&dev->res)); if (!rtc->base) { ret = -ENOMEM; @@ -128,12 +135,9 @@ static int pl030_probe(struct amba_device *dev, const struct amba_id *id) if (ret) goto err_irq; - rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops, - THIS_MODULE); - if (IS_ERR(rtc->rtc)) { - ret = PTR_ERR(rtc->rtc); + ret = rtc_register_device(rtc->rtc); + if (ret) goto err_reg; - } return 0; @@ -154,7 +158,6 @@ static int pl030_remove(struct amba_device *dev) writel(0, rtc->base + RTC_CR); free_irq(dev->irq[0], rtc); - rtc_device_unregister(rtc->rtc); iounmap(rtc->base); amba_release_regions(dev); -- 2.20.1