From patchwork Tue Dec 18 06:43:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yongjun X-Patchwork-Id: 10734861 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 345016C2 for ; Tue, 18 Dec 2018 06:36:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 22B88299CC for ; Tue, 18 Dec 2018 06:36:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 135692A529; Tue, 18 Dec 2018 06:36:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A0880299CC for ; Tue, 18 Dec 2018 06:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=KlrorAiio/cRgN2z9eQ7KIx1Jx4mczsqNIQVfR+6iw8=; b=MykcrgVkwVwb04 7BrXhBJZLITA4FSu9htNiU1kYwVXzTOrObOebIr8qimyvYmRkqKFRRb4sZHd0Lcm6SBJcBr7Gk8Af /Q9H8hvMLLAG/od5LJryvXEDt30vMY7pABp5Ny2DpIT1j7fvjxO7/IqI8KkU7YL4hHE06Zz5LdCI0 w0tJg3As7v+f0zJIPoFDrLqphE9HxEyU15iHNLpoMNzW2IdJWV3+vqu9J/SREpEYw54/VeG+Xsk02 848dKDRSRplpxX3Rpgo+m+tWw60zaS/ew58IpPtXIn3CFvh+uG7rVjq/HniUY1GxJwxCSEV2Uy/G5 6Eu4YA0h8jOJ5xo5XWLw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gZ8z1-0004b2-EW; Tue, 18 Dec 2018 06:35:59 +0000 Received: from szxga07-in.huawei.com ([45.249.212.35] helo=huawei.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gZ8yy-0004a4-Eb for linux-arm-kernel@lists.infradead.org; Tue, 18 Dec 2018 06:35:58 +0000 Received: from DGGEMS411-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 17E373EFEB588; Tue, 18 Dec 2018 14:35:39 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS411-HUB.china.huawei.com (10.3.19.211) with Microsoft SMTP Server id 14.3.408.0; Tue, 18 Dec 2018 14:35:31 +0800 From: Wei Yongjun To: Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , "Michael Turquette" , Stephen Boyd , "Aisheng Dong" Subject: [PATCH -next] clk: imx: fix potential NULL dereference in imx8qxp_lpcg_clk_probe() Date: Tue, 18 Dec 2018 06:43:09 +0000 Message-ID: <1545115389-173136-1-git-send-email-weiyongjun1@huawei.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181217_223556_660079_9FB7881E X-CRM114-Status: UNSURE ( 9.50 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel-janitors@vger.kernel.org, Wei Yongjun , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP platform_get_resource() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference a bit later in the code. This is detected by Coccinelle semantic patch. @@ expression pdev, res, n, t, e, e1, e2; @@ res = platform_get_resource(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2); Fixes: 1e3121bfe51a ("clk: imx: add imx8qxp lpcg driver") Signed-off-by: Wei Yongjun Reviewed-by: Dong Aisheng --- drivers/clk/imx/clk-imx8qxp-lpcg.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c b/drivers/clk/imx/clk-imx8qxp-lpcg.c index dcae1dd..8f241a4 100644 --- a/drivers/clk/imx/clk-imx8qxp-lpcg.c +++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c @@ -169,6 +169,8 @@ static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev) return -ENODEV; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; base = devm_ioremap(dev, res->start, resource_size(res)); if (!base) return -ENOMEM;