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GET /api/patches/2224064/?format=api
{ "id": 2224064, "url": "http://patchwork.ozlabs.org/api/patches/2224064/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260416180107.777065-15-kwilczynski@kernel.org/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260416180107.777065-15-kwilczynski@kernel.org>", "list_archive_url": null, "date": "2026-04-16T18:00:58", "name": "[v5,14/23] alpha/PCI: Fix __pci_mmap_fits() overflow for zero-length BARs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "100c4fa502870b129bd76114dccda63012eede9a", "submitter": { "id": 86709, "url": "http://patchwork.ozlabs.org/api/people/86709/?format=api", "name": "Krzysztof Wilczyński", "email": "kwilczynski@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260416180107.777065-15-kwilczynski@kernel.org/mbox/", "series": [ { "id": 500193, "url": "http://patchwork.ozlabs.org/api/series/500193/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=500193", "date": "2026-04-16T18:00:44", "name": "PCI: Convert all dynamic sysfs attributes to static", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/500193/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224064/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224064/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-52638-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=UKTJpz1E;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-pci+bounces-52638-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"UKTJpz1E\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201" ], "Received": [ "from tor.lore.kernel.org (tor.lore.kernel.org [172.105.105.114])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxQnt4ngfz1yD3\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 17 Apr 2026 04:02:10 +1000 (AEST)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby tor.lore.kernel.org (Postfix) with ESMTP id E11C9305B2DB\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 16 Apr 2026 18:02:02 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id D4B822EC0A7;\n\tThu, 16 Apr 2026 18:02:01 +0000 (UTC)", "from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id B133232E12E;\n\tThu, 16 Apr 2026 18:02:01 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id 2749EC2BCB0;\n\tThu, 16 Apr 2026 18:01:58 +0000 (UTC)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1776362521; cv=none;\n b=cxicO4AwEvrdxO57AjE0TUNV7hE+S9Mul3cvLkmFLXZmJr4I4/ykElcTEJIny0XjvWpRBbOfV6l4ZHc81A/Tg2jt+qYERGng4jBTm3pwYv75B3SqaeeYnaRaXYXz8z2ZIQmLKfJfCvgRo0LBRHIv8rDVZWq93AEXEYoQJwxVcCE=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1776362521; c=relaxed/simple;\n\tbh=QOViSCcvUL9uyzox8/RADcIRKqDxy6ADtOAMBKvcXqE=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version:Content-Type;\n b=Q7oGLlTILmxmjlwqH9SVODu0ABocM1WJF71dF39hHeg2goNVdSRWmTlaaLlP7nXfGiWwg5hgWkdxr/PANj4lgaXnKMaxOqrd185oRCM0M9ZrQYK1314gv024tOELPBu8Bv6irtjJGCQNCTBMX2AM3YS+Gb8jWMpw7/pchuwClDU=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=UKTJpz1E; arc=none smtp.client-ip=10.30.226.201", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1776362521;\n\tbh=QOViSCcvUL9uyzox8/RADcIRKqDxy6ADtOAMBKvcXqE=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=UKTJpz1EAj5v6XqpXjYRWO2k81NaT8TbDwK6s2pv53HM7HaGAgCPS+XiXklModdHg\n\t iDJ9/fSyrZZzc+rFVaUmTdsdnSwpjP0ZLRBmtuX15LCWPG0EHIMBMtwLxY1mTMwwBt\n\t wDdhfZBJxCbsKeyO+1yi0Lw4EpD9HK7wDLG7mT0v3m787VKgIXpxE60KFFnAR/t+dS\n\t iZCJSpAsSzKgSUVKVZJ/SczeD46HhcPlVBjICZUKlAgjU/HW/Qi4IaRNHa8eTJZmRu\n\t yvFNhlNnDZoRs9N7euu8XylTXyNx/MmKUdTRJwXu1QAV4lZaZrCqwiXf+R8pyuZHev\n\t EtrfC/LJyfLoQ==", "From": "=?utf-8?q?Krzysztof_Wilczy=C5=84ski?= <kwilczynski@kernel.org>", "To": "Bjorn Helgaas <bhelgaas@google.com>", "Cc": "Bjorn Helgaas <helgaas@kernel.org>,\n Manivannan Sadhasivam <mani@kernel.org>,\n Lorenzo Pieralisi <lpieralisi@kernel.org>,\n Magnus Lindholm <linmag7@gmail.com>, Matt Turner <mattst88@gmail.com>,\n Richard Henderson <richard.henderson@linaro.org>,\n Christophe Leroy <chleroy@kernel.org>,\n Madhavan Srinivasan <maddy@linux.ibm.com>,\n Michael Ellerman <mpe@ellerman.id.au>, Nicholas Piggin <npiggin@gmail.com>,\n Dexuan Cui <decui@microsoft.com>,\n =?utf-8?q?Krzysztof_Ha=C5=82asa?= <khalasa@piap.pl>,\n Lukas Wunner <lukas@wunner.de>, \"Oliver O'Halloran\" <oohall@gmail.com>,\n Saurabh Singh Sengar <ssengar@microsoft.com>,\n Shuan He <heshuan@bytedance.com>, Srivatsa Bhat <srivatsabhat@microsoft.com>,\n\t=?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>,\n linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org,\n linuxppc-dev@lists.ozlabs.org", "Subject": "[PATCH v5 14/23] alpha/PCI: Fix __pci_mmap_fits() overflow for\n zero-length BARs", "Date": "Thu, 16 Apr 2026 18:00:58 +0000", "Message-ID": "<20260416180107.777065-15-kwilczynski@kernel.org>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260416180107.777065-1-kwilczynski@kernel.org>", "References": "<20260416180107.777065-1-kwilczynski@kernel.org>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit" }, "content": "Currently, __pci_mmap_fits() computes the BAR size using\npci_resource_len() - 1, which wraps to a large value when the\nBAR length is zero, causing the bounds check to incorrectly\nsucceed.\n\nThus, add an early return for empty resources.\n\nFixes: 10a0ef39fbd1 (\"PCI/alpha: pci sysfs resources\")\nTested-by: Magnus Lindholm <linmag7@gmail.com>\nReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>\nAcked-by: Magnus Lindholm <linmag7@gmail.com>\nSigned-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>\n---\n arch/alpha/kernel/pci-sysfs.c | 6 +++++-\n 1 file changed, 5 insertions(+), 1 deletion(-)", "diff": "diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c\nindex 5c29f1d2821c..8802f955256e 100644\n--- a/arch/alpha/kernel/pci-sysfs.c\n+++ b/arch/alpha/kernel/pci-sysfs.c\n@@ -37,12 +37,16 @@ static int hose_mmap_page_range(struct pci_controller *hose,\n static int __pci_mmap_fits(struct pci_dev *pdev, int num,\n \t\t\t struct vm_area_struct *vma, int sparse)\n {\n+\tresource_size_t len = pci_resource_len(pdev, num);\n \tunsigned long nr, start, size;\n \tint shift = sparse ? 5 : 0;\n \n+\tif (!len)\n+\t\treturn 0;\n+\n \tnr = vma_pages(vma);\n \tstart = vma->vm_pgoff;\n-\tsize = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;\n+\tsize = ((len - 1) >> (PAGE_SHIFT - shift)) + 1;\n \n \tif (start < size && size - start >= nr)\n \t\treturn 1;\n", "prefixes": [ "v5", "14/23" ] }