From patchwork Thu Sep 10 14:58:58 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriele Paoloni X-Patchwork-Id: 516311 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 59389140281 for ; Fri, 11 Sep 2015 00:52:11 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751469AbbIJOwK (ORCPT ); Thu, 10 Sep 2015 10:52:10 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:38919 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751183AbbIJOwJ (ORCPT ); Thu, 10 Sep 2015 10:52:09 -0400 Received: from 172.24.1.50 (EHLO SZXEML429-HUB.china.huawei.com) ([172.24.1.50]) by szxrg03-dlp.huawei.com (MOS 4.4.3-GA FastPath queued) with ESMTP id BMR25010; Thu, 10 Sep 2015 22:52:07 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by SZXEML429-HUB.china.huawei.com (10.82.67.184) with Microsoft SMTP Server id 14.3.235.1; Thu, 10 Sep 2015 22:51:59 +0800 From: Gabriele Paoloni To: , , CC: , , , , , , , Subject: [PATCH v2 3/3] PCI: designware: add sanity checks on the header offset in dw_pcie_cfg_read and dw_pcie_cfg_write Date: Thu, 10 Sep 2015 22:58:58 +0800 Message-ID: <1441897138-23251-4-git-send-email-gabriele.paoloni@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1441897138-23251-1-git-send-email-gabriele.paoloni@huawei.com> References: <1441897138-23251-1-git-send-email-gabriele.paoloni@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090201.55F19917.0062, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 2048b4721e83f0780155a646b1dd01d5 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: gabriele paoloni This patch adds sanity checks on "where" input parameter in dw_pcie_cfg_read and dw_pcie_cfg_write. These checks make sure that offset passed in by the caller is not in conflict with the size of the PCI header field that is being read/written Signed-off-by: Gabriele Paoloni --- drivers/pci/host/pcie-designware.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 4f8ff80..c0825b7 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -88,9 +88,14 @@ int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val) if (size == 1) *val = (*val >> (8 * where)) & 0xff; - else if (size == 2) + else if (size == 2) { + if (where & 1) + return PCIBIOS_BAD_REGISTER_NUMBER; *val = (*val >> (8 * where)) & 0xffff; - else if (size != 4) + } else if (size == 4) { + if (where & 3) + return PCIBIOS_BAD_REGISTER_NUMBER; + } else return PCIBIOS_BAD_REGISTER_NUMBER; return PCIBIOS_SUCCESSFUL; @@ -100,11 +105,15 @@ int dw_pcie_cfg_write(void __iomem *addr, int where, int size, u32 val) { addr += where; - if (size == 4) + if (size == 4) { + if ((uintptr_t)addr & 3) + return PCIBIOS_BAD_REGISTER_NUMBER; writel(val, addr); - else if (size == 2) + } else if (size == 2) { + if ((uintptr_t)addr & 1) + return PCIBIOS_BAD_REGISTER_NUMBER; writew(val, addr); - else if (size == 1) + } else if (size == 1) writeb(val, addr); else return PCIBIOS_BAD_REGISTER_NUMBER;