From patchwork Wed Jul 11 13:17:38 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yongjun X-Patchwork-Id: 10519719 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 07AD5600CA for ; Wed, 11 Jul 2018 13:09:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EC6EC28E96 for ; Wed, 11 Jul 2018 13:09:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E058328E99; Wed, 11 Jul 2018 13:09:30 +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=-2.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI,T_DKIM_INVALID 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 8DDEB28E96 for ; Wed, 11 Jul 2018 13:09:30 +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=napShsZM7/PwrHjSytnQsqNPLly/rkQFx12QShkZAuU=; b=DBbeJkN32FCIvo hcGU3NHdDyEIxHueYz6a4Gf/aheCdvCZWWteNqsW6L6hOf7cbRVCXxFhmcCExVUcaHVbY/YD/nFY+ JOfW/BuM/PciT7eq7Z7P7GxI897VRxCnwnyGI3w2wOrelre6yEGbj5nXyQTopXgmApK58xI9y900N RPc0NjUCczhcow3C4pmEddUazxMfT2GqA8Ti48Xci2qit75ZQbbp8bTmmGc9A6ZqyArblXhIFA47J IqozrGRkUXTWIONPvQnbhgeXIJC69Dkp1sV8zfeXo+DFNnedBnRHDdZeKCIEDx16hEDe5zc1sLYCl Zl9yP6DAuZZPIpgNB+3A==; 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 1fdEs1-0002lV-8q; Wed, 11 Jul 2018 13:09:25 +0000 Received: from szxga06-in.huawei.com ([45.249.212.32] helo=huawei.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fdErf-0002gx-0K for linux-arm-kernel@lists.infradead.org; Wed, 11 Jul 2018 13:09:20 +0000 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id EBB202E3789CF; Wed, 11 Jul 2018 21:08:49 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.382.0; Wed, 11 Jul 2018 21:08:42 +0800 From: Wei Yongjun To: Arnd Bergmann , Greg Kroah-Hartman , Liviu Dudau , Sudeep Holla , Lorenzo Pieralisi Subject: [PATCH -next] misc: vexpress: Fix potential NULL dereference in vexpress_syscfg_probe() Date: Wed, 11 Jul 2018 13:17:38 +0000 Message-ID: <1531315058-183762-1-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-20180711_060903_509310_656E0977 X-CRM114-Status: UNSURE ( 8.64 ) 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-kernel@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); Signed-off-by: Wei Yongjun --- drivers/misc/vexpress-syscfg.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/misc/vexpress-syscfg.c b/drivers/misc/vexpress-syscfg.c index 9eea30f..2d72c93 100644 --- a/drivers/misc/vexpress-syscfg.c +++ b/drivers/misc/vexpress-syscfg.c @@ -259,6 +259,8 @@ static int vexpress_syscfg_probe(struct platform_device *pdev) INIT_LIST_HEAD(&syscfg->funcs); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), pdev->name)) return -EBUSY;