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=-12.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 C490BC433E0 for ; Tue, 14 Jul 2020 10:04:41 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9963B221FD for ; Tue, 14 Jul 2020 10:04:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XktoSDHv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9963B221FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linux-kernel-mentees-bounces@lists.linuxfoundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 8A1AC8A3D2; Tue, 14 Jul 2020 10:04:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tRkEH9z9uC98; Tue, 14 Jul 2020 10:04:39 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id 5C43E8A3D3; Tue, 14 Jul 2020 10:04:39 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 4A479C0891; Tue, 14 Jul 2020 10:04:39 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 3AA7FC1797 for ; Tue, 14 Jul 2020 10:04:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 32E958A3C1 for ; Tue, 14 Jul 2020 10:04:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vbjDKH5I8rFt for ; Tue, 14 Jul 2020 10:04:37 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-ed1-f67.google.com (mail-ed1-f67.google.com [209.85.208.67]) by whitealder.osuosl.org (Postfix) with ESMTPS id 373D28A397 for ; Tue, 14 Jul 2020 10:04:37 +0000 (UTC) Received: by mail-ed1-f67.google.com with SMTP id b15so16402686edy.7 for ; Tue, 14 Jul 2020 03:04:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=AjG9ZXkNlThAdSsdCQVBfTOrnZyMZnOrLKfSK8ObxrE=; b=XktoSDHvwVEyA2qSIGNOe+27lD8+It+w/oscI06k1+IugxY4fNo2iArgZd7tJ3tb5O RZLCpZitcssWbDWunZax7lwh9Ub95pp+os7YmA1wVFQDvEkawcTNqADWbZKkp6tPST+L 0s2KtGLEv1ioVe3n135P1Uxczafk+qydGAZ3fXM6ExjpuPgazhaCAFxHSbqeWtQhQZYJ UaXEnOhyR07Hvudk1fhTt6QO6f57G7Lu9TsSqwH+516GePqs2elh6vuHaWvsBRyfb9vL ijKUVWQqPdfzp/6LgoJCP0wzjZ1REOKByf9BIwseFbU07cEx/bPJr7KvC+/n6vjQqGQ/ 0zJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=AjG9ZXkNlThAdSsdCQVBfTOrnZyMZnOrLKfSK8ObxrE=; b=JGPJ33NHwXkzi2d2272OMSUQW4MsR7ai3hmPa4O5M/V770t4/+dS+zSNkq22Ta6jfP uJU8La20zmAwgVNUzM2t4jBsO8DR6uxa6TRQzOUvL1ABam8qY/c2cuYDqNWrnR+JDHrn PtI8DnFaTh+6IGj6QjgN7lThMfQbk4zcHKjOsEGiiqqzK5WEoCuU03lKVOVndhPqv4+W J8mCT0C5IAVnM68lBpPhTyzyUDgOo2AKP15EPPg7kjQhooIl5iH5qk0T7AmX3dbseJax VpLy4Slm+wPrhMrbma68qQNxNx6CQQHvCT62CdUtlDd4kiyUCtPu2qecTe4z2mb35PRR vqRw== X-Gm-Message-State: AOAM532+LIdjvnZDH2G+XoBbfy6Kh22e8jcCvlYUThlFHkYBzo/+ZgGB aj09gPn3ZIOeX0hqf0z3B/g= X-Google-Smtp-Source: ABdhPJw4d+6fAHfArS6YVCLKVPm4T/c8KMuzMlKt/TwrMSjQlmp+/J9pYfzHKZouoVLK/LJ5+omnQQ== X-Received: by 2002:aa7:c305:: with SMTP id l5mr3754952edq.163.1594721075471; Tue, 14 Jul 2020 03:04:35 -0700 (PDT) Received: from net.saheed (54007186.dsl.pool.telekom.hu. [84.0.113.134]) by smtp.gmail.com with ESMTPSA id bs18sm14137672edb.38.2020.07.14.03.04.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jul 2020 03:04:35 -0700 (PDT) From: Saheed Olayemi Bolarinwa To: helgaas@kernel.org Date: Tue, 14 Jul 2020 13:04:44 +0200 Message-Id: <20200714110445.32605-3-refactormyself@gmail.com> X-Mailer: git-send-email 2.18.2 In-Reply-To: <20200714110445.32605-1-refactormyself@gmail.com> References: <20200714110445.32605-1-refactormyself@gmail.com> Cc: Bolarinwa Olayemi Saheed , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [Linux-kernel-mentees] [PATCH 10/14 v4] PCI: Check return value of pcie_capability_read_*() X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" From: Bolarinwa Olayemi Saheed On failure pcie_capability_read_dword() sets it's last parameter, val to 0. However, with Patch 14/14, it is possible that val is set to ~0 on failure. This would introduce a bug because (x & x) == (~0 & x). This bug can be avoided if the return value of pcie_capability_read_word is checked to confirm success. Check the return value of pcie_capability_read_word() to ensure success. Suggested-by: Bjorn Helgaas Signed-off-by: Bolarinwa Olayemi Saheed --- v4 changes: Remove unnecessary boolean conversion. drivers/pci/probe.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2f66988cea25..3c87a8a1d4b5 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1121,10 +1121,11 @@ EXPORT_SYMBOL(pci_add_new_bus); static void pci_enable_crs(struct pci_dev *pdev) { u16 root_cap = 0; + int ret; /* Enable CRS Software Visibility if supported */ - pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); - if (root_cap & PCI_EXP_RTCAP_CRSVIS) + ret = pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); + if (!ret && (root_cap & PCI_EXP_RTCAP_CRSVIS)) pcie_capability_set_word(pdev, PCI_EXP_RTCTL, PCI_EXP_RTCTL_CRSSVE); } @@ -1519,9 +1520,10 @@ void set_pcie_port_type(struct pci_dev *pdev) void set_pcie_hotplug_bridge(struct pci_dev *pdev) { u32 reg32; + int ret; - pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); - if (reg32 & PCI_EXP_SLTCAP_HPC) + ret = pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); + if (!ret && (reg32 & PCI_EXP_SLTCAP_HPC)) pdev->is_hotplug_bridge = 1; } @@ -2057,10 +2059,11 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign) bool pcie_relaxed_ordering_enabled(struct pci_dev *dev) { u16 v; + int ret; - pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &v); + ret = pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &v); - return !!(v & PCI_EXP_DEVCTL_RELAX_EN); + return (!ret && (v & PCI_EXP_DEVCTL_RELAX_EN)); } EXPORT_SYMBOL(pcie_relaxed_ordering_enabled); @@ -2096,16 +2099,17 @@ static void pci_configure_ltr(struct pci_dev *dev) struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); struct pci_dev *bridge; u32 cap, ctl; + int ret; if (!pci_is_pcie(dev)) return; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); - if (!(cap & PCI_EXP_DEVCAP2_LTR)) + ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); + if (ret || !(cap & PCI_EXP_DEVCAP2_LTR)) return; - pcie_capability_read_dword(dev, PCI_EXP_DEVCTL2, &ctl); - if (ctl & PCI_EXP_DEVCTL2_LTR_EN) { + ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCTL2, &ctl); + if (!ret && (ctl & PCI_EXP_DEVCTL2_LTR_EN)) { if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) { dev->ltr_path = 1; return; @@ -2142,12 +2146,13 @@ static void pci_configure_eetlp_prefix(struct pci_dev *dev) struct pci_dev *bridge; int pcie_type; u32 cap; + int ret; if (!pci_is_pcie(dev)) return; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); - if (!(cap & PCI_EXP_DEVCAP2_EE_PREFIX)) + ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); + if (ret || !(cap & PCI_EXP_DEVCAP2_EE_PREFIX)) return; pcie_type = pci_pcie_type(dev); -- 2.18.2 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees 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=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 94DC0C433EC for ; Tue, 14 Jul 2020 10:04:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74801221FD for ; Tue, 14 Jul 2020 10:04:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XktoSDHv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727786AbgGNKEo (ORCPT ); Tue, 14 Jul 2020 06:04:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726788AbgGNKEh (ORCPT ); Tue, 14 Jul 2020 06:04:37 -0400 Received: from mail-ed1-x544.google.com (mail-ed1-x544.google.com [IPv6:2a00:1450:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C77C2C061755; Tue, 14 Jul 2020 03:04:36 -0700 (PDT) Received: by mail-ed1-x544.google.com with SMTP id z17so16406616edr.9; Tue, 14 Jul 2020 03:04:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=AjG9ZXkNlThAdSsdCQVBfTOrnZyMZnOrLKfSK8ObxrE=; b=XktoSDHvwVEyA2qSIGNOe+27lD8+It+w/oscI06k1+IugxY4fNo2iArgZd7tJ3tb5O RZLCpZitcssWbDWunZax7lwh9Ub95pp+os7YmA1wVFQDvEkawcTNqADWbZKkp6tPST+L 0s2KtGLEv1ioVe3n135P1Uxczafk+qydGAZ3fXM6ExjpuPgazhaCAFxHSbqeWtQhQZYJ UaXEnOhyR07Hvudk1fhTt6QO6f57G7Lu9TsSqwH+516GePqs2elh6vuHaWvsBRyfb9vL ijKUVWQqPdfzp/6LgoJCP0wzjZ1REOKByf9BIwseFbU07cEx/bPJr7KvC+/n6vjQqGQ/ 0zJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=AjG9ZXkNlThAdSsdCQVBfTOrnZyMZnOrLKfSK8ObxrE=; b=ku0vuYgkIqG0JhqPOvabSObs2wT4DAd71DoCBCpIKflyVWwPYK1RnJN4TPr3MLVBi9 3d5tNvapVs1tcu93AZl6OwicBAnxs15ajElKK5FhCxR9/nR+9eCy2RDu6bQxn6pQjJ/c afDIrx2Vz9RphrgaY13qCczdNmyRjXHY8J8lvFXnMMYl6gEYf331NakZgF4mF1HWnGQv WNY0efN6o8p5ilnLOob2InpzAnIMpYDTNXTQqtSu5q+UGz6hIumDGuevcw2OcVkRcjeo JW5YDuG2/gQO6NWePoFmC6jaYE/DiFOAv5+lBsUHdlrMwU3tnWSs+jcwYBWSNikkVyRr xXMw== X-Gm-Message-State: AOAM532axULvVGz09qzDcibd+MQX2Ef8FX0jNEym2me4HDJkDrcKrDG/ 8i3X6baKGy+dIi+iX1vWCs4= X-Google-Smtp-Source: ABdhPJw4d+6fAHfArS6YVCLKVPm4T/c8KMuzMlKt/TwrMSjQlmp+/J9pYfzHKZouoVLK/LJ5+omnQQ== X-Received: by 2002:aa7:c305:: with SMTP id l5mr3754952edq.163.1594721075471; Tue, 14 Jul 2020 03:04:35 -0700 (PDT) Received: from net.saheed (54007186.dsl.pool.telekom.hu. [84.0.113.134]) by smtp.gmail.com with ESMTPSA id bs18sm14137672edb.38.2020.07.14.03.04.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jul 2020 03:04:35 -0700 (PDT) From: Saheed Olayemi Bolarinwa To: helgaas@kernel.org Cc: Bolarinwa Olayemi Saheed , bjorn@helgaas.com, skhan@linuxfoundation.org, linux-pci@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [PATCH 10/14 v4] PCI: Check return value of pcie_capability_read_*() Date: Tue, 14 Jul 2020 13:04:44 +0200 Message-Id: <20200714110445.32605-3-refactormyself@gmail.com> X-Mailer: git-send-email 2.18.2 In-Reply-To: <20200714110445.32605-1-refactormyself@gmail.com> References: <20200714110445.32605-1-refactormyself@gmail.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bolarinwa Olayemi Saheed On failure pcie_capability_read_dword() sets it's last parameter, val to 0. However, with Patch 14/14, it is possible that val is set to ~0 on failure. This would introduce a bug because (x & x) == (~0 & x). This bug can be avoided if the return value of pcie_capability_read_word is checked to confirm success. Check the return value of pcie_capability_read_word() to ensure success. Suggested-by: Bjorn Helgaas Signed-off-by: Bolarinwa Olayemi Saheed --- v4 changes: Remove unnecessary boolean conversion. drivers/pci/probe.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2f66988cea25..3c87a8a1d4b5 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1121,10 +1121,11 @@ EXPORT_SYMBOL(pci_add_new_bus); static void pci_enable_crs(struct pci_dev *pdev) { u16 root_cap = 0; + int ret; /* Enable CRS Software Visibility if supported */ - pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); - if (root_cap & PCI_EXP_RTCAP_CRSVIS) + ret = pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); + if (!ret && (root_cap & PCI_EXP_RTCAP_CRSVIS)) pcie_capability_set_word(pdev, PCI_EXP_RTCTL, PCI_EXP_RTCTL_CRSSVE); } @@ -1519,9 +1520,10 @@ void set_pcie_port_type(struct pci_dev *pdev) void set_pcie_hotplug_bridge(struct pci_dev *pdev) { u32 reg32; + int ret; - pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); - if (reg32 & PCI_EXP_SLTCAP_HPC) + ret = pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); + if (!ret && (reg32 & PCI_EXP_SLTCAP_HPC)) pdev->is_hotplug_bridge = 1; } @@ -2057,10 +2059,11 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign) bool pcie_relaxed_ordering_enabled(struct pci_dev *dev) { u16 v; + int ret; - pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &v); + ret = pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &v); - return !!(v & PCI_EXP_DEVCTL_RELAX_EN); + return (!ret && (v & PCI_EXP_DEVCTL_RELAX_EN)); } EXPORT_SYMBOL(pcie_relaxed_ordering_enabled); @@ -2096,16 +2099,17 @@ static void pci_configure_ltr(struct pci_dev *dev) struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); struct pci_dev *bridge; u32 cap, ctl; + int ret; if (!pci_is_pcie(dev)) return; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); - if (!(cap & PCI_EXP_DEVCAP2_LTR)) + ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); + if (ret || !(cap & PCI_EXP_DEVCAP2_LTR)) return; - pcie_capability_read_dword(dev, PCI_EXP_DEVCTL2, &ctl); - if (ctl & PCI_EXP_DEVCTL2_LTR_EN) { + ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCTL2, &ctl); + if (!ret && (ctl & PCI_EXP_DEVCTL2_LTR_EN)) { if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) { dev->ltr_path = 1; return; @@ -2142,12 +2146,13 @@ static void pci_configure_eetlp_prefix(struct pci_dev *dev) struct pci_dev *bridge; int pcie_type; u32 cap; + int ret; if (!pci_is_pcie(dev)) return; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); - if (!(cap & PCI_EXP_DEVCAP2_EE_PREFIX)) + ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap); + if (ret || !(cap & PCI_EXP_DEVCAP2_EE_PREFIX)) return; pcie_type = pci_pcie_type(dev); -- 2.18.2