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GET /api/1.2/patches/2222357/?format=api
{ "id": 2222357, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2222357/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260411080148.471335-16-kwilczynski@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.2/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260411080148.471335-16-kwilczynski@kernel.org>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260411080148.471335-16-kwilczynski@kernel.org/", "date": "2026-04-11T08:01:39", "name": "[v4,15/24] 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/1.2/people/86709/?format=api", "name": "Krzysztof Wilczyński", "email": "kwilczynski@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260411080148.471335-16-kwilczynski@kernel.org/mbox/", "series": [ { "id": 499538, "url": "http://patchwork.ozlabs.org/api/1.2/series/499538/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499538", "date": "2026-04-11T08:01:24", "name": "PCI: Convert all dynamic sysfs attributes to static", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/499538/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222357/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222357/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19635-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.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=URmQWa3q;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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Sat, 11 Apr 2026 18:03:54 +1000 (AEST)", "from boromir.ozlabs.org (localhost [127.0.0.1])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 4ft5kc2BC5z30hr;\n\tSat, 11 Apr 2026 18:02:48 +1000 (AEST)", "from sea.source.kernel.org (sea.source.kernel.org\n [IPv6:2600:3c0a:e001:78e:0:1991:8:25])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 4ft5kb4rgLz2yk6\n\tfor <linuxppc-dev@lists.ozlabs.org>; Sat, 11 Apr 2026 18:02:47 +1000 (AEST)", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n\tby sea.source.kernel.org (Postfix) with ESMTP id 111464405F;\n\tSat, 11 Apr 2026 08:02:46 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id B9153C2BC9E;\n\tSat, 11 Apr 2026 08:02:42 +0000 (UTC)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1775894568;\n\tcv=none;\n b=KSgUvZQ9hMOcoZ+gt/ca+AugZHVeBGA02ggAtGQZ1dmDE3FXrFfvU5ZYi5dqz7za4tCCjrFs1KF1dY6HXccJusKYrS0Cri9hFczwUS067oTmLsoJH3C3Wm9RJPvvjSKqr3+5K203nTBCGO7C/mNuonhRhDL6Q6pPDmafRKv+d0hss4oHTBPcSibpNB21FzxWlbuDGwAkBjN0gfisGNpnAY+llAbbTN/9GPEIusgtSfufr2/O0RLxxWLih86E+654vMYmg1G50L2rro2iwkXyd6l2FdxTWmzr30oBYMJlRq0U1j1JsoZ4CD7sNtXBq9dxREXUapXw7uR8HtYngaIV0w==", "ARC-Message-Signature": "i=1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775894565;\n\tbh=DXESaPnzd7c3JQ2Cj6QdfGEnPi+ZFUUE0vNpiijc+CQ=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=URmQWa3q2QkaBIhjekHwjkIQ6ygmAcCk5P7N+qFY0DtVxyE4GgfwvJ3JEPbkiTZo0\n\t OTIcElHxkmygEAmNHNZNqL58DBxmbgmSiRDcnnK9pATkqoFX11xo6/LTtY16Azxdck\n\t nPSw8oAsZf1/hN1NkW8rubQCLJH3CBftLKXXREIbbTKUVKN5BEOi94irqitjc/w6+d\n\t pRY5BdvzfBn/a8vSMcBxYI32ElWedqiNvwXzpJ8C7HHpOzIkl2ONIBwgq1Tzoex5y/\n\t 3YyA+tPjvODPYccpayyfAriUwS/JE8X9pyCPNvMWzzI43+Mq4+tzaFzDNiUcCnyjw1\n\t xdZXqbiut/HmA==", "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 v4 15/24] alpha/PCI: Fix __pci_mmap_fits() overflow for\n zero-length BARs", "Date": "Sat, 11 Apr 2026 08:01:39 +0000", "Message-ID": "<20260411080148.471335-16-kwilczynski@kernel.org>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260411080148.471335-1-kwilczynski@kernel.org>", "References": "<20260411080148.471335-1-kwilczynski@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "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\")\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 6c011dab326d..2748000a7486 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": [ "v4", "15/24" ] }