From patchwork Fri Apr 29 08:07:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 567576 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBC39C433EF for ; Fri, 29 Apr 2022 07:55:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355315AbiD2H7L (ORCPT ); Fri, 29 Apr 2022 03:59:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355298AbiD2H7F (ORCPT ); Fri, 29 Apr 2022 03:59:05 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 903814ECF6; Fri, 29 Apr 2022 00:55:47 -0700 (PDT) Received: from dggpemm500021.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4KqPt95v5szhYkp; Fri, 29 Apr 2022 15:55:29 +0800 (CST) Received: from dggpemm500007.china.huawei.com (7.185.36.183) by dggpemm500021.china.huawei.com (7.185.36.109) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 29 Apr 2022 15:55:45 +0800 Received: from huawei.com (10.175.103.91) by dggpemm500007.china.huawei.com (7.185.36.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 29 Apr 2022 15:55:44 +0800 From: Yang Yingliang To: , , CC: , Subject: [PATCH] PCI: qcom-ep: check return value after calling platform_get_resource_byname() Date: Fri, 29 Apr 2022 16:07:40 +0800 Message-ID: <20220429080740.1294797-1-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500007.china.huawei.com (7.185.36.183) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org If platform_get_resource_byname() fails, 'mmio_res' will be set to null pointer, it will cause null-ptr-deref when it used in qcom_pcie_perst_deassert(), so we need check the return value. Fixes: f55fee56a631 ("PCI: qcom-ep: Add Qualcomm PCIe Endpoint controller driver") Signed-off-by: Yang Yingliang --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 6ce8eddf3a37..becb0c2ff870 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -416,6 +416,10 @@ static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev, pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mmio"); + if (!pcie_ep->mmio_res) { + dev_err(dev, "Failed to get mmio resource\n"); + return -EINVAL; + } syscon = of_parse_phandle(dev->of_node, "qcom,perst-regs", 0); if (!syscon) {