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GET /api/1.0/patches/2175230/?format=api
{ "id": 2175230, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175230/?format=api", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/1.0/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 }, "msgid": "<20251217151609.3162665-2-den@valinux.co.jp>", "date": "2025-12-17T15:15:35", "name": "[RFC,v3,01/35] PCI: endpoint: pci-epf-vntb: Use array_index_nospec() on mws_size[] access", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d10baf3282d8e53e4075c91267dc7f3a58261e4a", "submitter": { "id": 91573, "url": "http://patchwork.ozlabs.org/api/1.0/people/91573/?format=api", "name": "Koichiro Den", "email": "den@valinux.co.jp" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20251217151609.3162665-2-den@valinux.co.jp/mbox/", "series": [ { "id": 485709, "url": "http://patchwork.ozlabs.org/api/1.0/series/485709/?format=api", "date": "2025-12-17T15:15:53", "name": "NTB transport backed by endpoint DW eDMA", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/485709/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2175230/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-pci+bounces-43203-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 (1024-bit key;\n unprotected) header.d=valinux.co.jp header.i=@valinux.co.jp\n header.a=rsa-sha256 header.s=selector1 header.b=GGJfGgtx;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n 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bh=bi06V0x6tmNQAvQ9aQlAgF6/LuakztYZpjDQre4adTY=;\n b=GGJfGgtxm/XMg/oy3toTu3SAQuNE9ege1UQceoAjFW7H7GLFQfN1YAmBjY66I1xSlDtNhXOpPv9ri8A5dFEBFQ5ju1eyY1Wkq5g2WX4w1l/K9FYVkkjegozBT5tGzpNi3U+QWqJyMaEMWq3EugqXK2OVTUHjPwi7KS03HX0FI8k=", "From": "Koichiro Den <den@valinux.co.jp>", "To": "Frank.Li@nxp.com,\n\tdave.jiang@intel.com,\n\tntb@lists.linux.dev,\n\tlinux-pci@vger.kernel.org,\n\tdmaengine@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tnetdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Cc": "mani@kernel.org,\n\tkwilczynski@kernel.org,\n\tkishon@kernel.org,\n\tbhelgaas@google.com,\n\tcorbet@lwn.net,\n\tgeert+renesas@glider.be,\n\tmagnus.damm@gmail.com,\n\trobh@kernel.org,\n\tkrzk+dt@kernel.org,\n\tconor+dt@kernel.org,\n\tvkoul@kernel.org,\n\tjoro@8bytes.org,\n\twill@kernel.org,\n\trobin.murphy@arm.com,\n\tjdmason@kudzu.us,\n\tallenbh@gmail.com,\n\tandrew+netdev@lunn.ch,\n\tdavem@davemloft.net,\n\tedumazet@google.com,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\tBasavaraj.Natikar@amd.com,\n\tShyam-sundar.S-k@amd.com,\n\tkurt.schwemmer@microsemi.com,\n\tlogang@deltatee.com,\n\tjingoohan1@gmail.com,\n\tlpieralisi@kernel.org,\n\tutkarsh02t@gmail.com,\n\tjbrunet@baylibre.com,\n\tdlemoal@kernel.org,\n\tarnd@arndb.de,\n\telfring@users.sourceforge.net,\n\tden@valinux.co.jp", "Subject": "[RFC PATCH v3 01/35] PCI: endpoint: pci-epf-vntb: Use\n array_index_nospec() on mws_size[] access", "Date": "Thu, 18 Dec 2025 00:15:35 +0900", "Message-ID": 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"X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n af1af3ef-3ee7-4224-f7c7-08de3d7f3800", "X-MS-Exchange-CrossTenant-AuthSource": "TYWP286MB2697.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "17 Dec 2025 15:16:14.3598\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "7a57bee8-f73d-4c5f-a4f7-d72c91c8c111", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n U0F4BC1xbvNd/XZtFsOlTca6bB/g03hbKLnqCqm6HFC9yM9eYDE9l2e8eC5ByOCO3Z5WKdrkY/iTd+f2SwOCVA==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "OS9P286MB4633" }, "content": "Follow common kernel idioms for indices derived from configfs attributes\nand suppress Smatch warnings:\n\n epf_ntb_mw1_show() warn: potential spectre issue 'ntb->mws_size' [r]\n epf_ntb_mw1_store() warn: potential spectre issue 'ntb->mws_size' [w]\n\nAlso fix the error message for out-of-range MW indices and %lld format\nfor unsigned values.\n\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\nNote: I noticed [RFC PATCH v2 01/27] resurrected the Smatch warnings\nhttps://lore.kernel.org/all/20251129160405.2568284-2-den@valinux.co.jp/\nThis RFC v3 version therefore reverts to the RFC v1 style, with one\nadditional fix to correct the sprintf format specifier (%lld->%llu).\n---\n drivers/pci/endpoint/functions/pci-epf-vntb.c | 24 +++++++++++--------\n 1 file changed, 14 insertions(+), 10 deletions(-)", "diff": "diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c\nindex 3ecc5059f92b..56aab5d354d6 100644\n--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c\n+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c\n@@ -995,17 +995,19 @@ static ssize_t epf_ntb_##_name##_show(struct config_item *item,\t\t\\\n \tstruct config_group *group = to_config_group(item);\t\t\\\n \tstruct epf_ntb *ntb = to_epf_ntb(group);\t\t\t\\\n \tstruct device *dev = &ntb->epf->dev;\t\t\t\t\\\n-\tint win_no;\t\t\t\t\t\t\t\\\n+\tint win_no, idx;\t\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n \tif (sscanf(#_name, \"mw%d\", &win_no) != 1)\t\t\t\\\n \t\treturn -EINVAL;\t\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n-\tif (win_no <= 0 || win_no > ntb->num_mws) {\t\t\t\\\n-\t\tdev_err(dev, \"Invalid num_nws: %d value\\n\", ntb->num_mws); \\\n+\tidx = win_no - 1;\t\t\t\t\t\t\\\n+\tif (idx < 0 || idx >= ntb->num_mws) {\t\t\t\t\\\n+\t\tdev_err(dev, \"MW%d out of range (num_mws=%d)\\n\",\t\\\n+\t\t\twin_no, ntb->num_mws);\t\t\t\t\\\n \t\treturn -EINVAL;\t\t\t\t\t\t\\\n \t}\t\t\t\t\t\t\t\t\\\n-\t\t\t\t\t\t\t\t\t\\\n-\treturn sprintf(page, \"%lld\\n\", ntb->mws_size[win_no - 1]);\t\\\n+\tidx = array_index_nospec(idx, ntb->num_mws);\t\t\t\\\n+\treturn sprintf(page, \"%llu\\n\", ntb->mws_size[idx]);\t\t\\\n }\n \n #define EPF_NTB_MW_W(_name)\t\t\t\t\t\t\\\n@@ -1015,7 +1017,7 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item,\t\\\n \tstruct config_group *group = to_config_group(item);\t\t\\\n \tstruct epf_ntb *ntb = to_epf_ntb(group);\t\t\t\\\n \tstruct device *dev = &ntb->epf->dev;\t\t\t\t\\\n-\tint win_no;\t\t\t\t\t\t\t\\\n+\tint win_no, idx;\t\t\t\t\t\t\\\n \tu64 val;\t\t\t\t\t\t\t\\\n \tint ret;\t\t\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n@@ -1026,12 +1028,14 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item,\t\\\n \tif (sscanf(#_name, \"mw%d\", &win_no) != 1)\t\t\t\\\n \t\treturn -EINVAL;\t\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n-\tif (win_no <= 0 || win_no > ntb->num_mws) {\t\t\t\\\n-\t\tdev_err(dev, \"Invalid num_nws: %d value\\n\", ntb->num_mws); \\\n+\tidx = win_no - 1;\t\t\t\t\t\t\\\n+\tif (idx < 0 || idx >= ntb->num_mws) {\t\t\t\t\\\n+\t\tdev_err(dev, \"MW%d out of range (num_mws=%d)\\n\",\t\\\n+\t\t\twin_no, ntb->num_mws);\t\t\t\t\\\n \t\treturn -EINVAL;\t\t\t\t\t\t\\\n \t}\t\t\t\t\t\t\t\t\\\n-\t\t\t\t\t\t\t\t\t\\\n-\tntb->mws_size[win_no - 1] = val;\t\t\t\t\\\n+\tidx = array_index_nospec(idx, ntb->num_mws);\t\t\t\\\n+\tntb->mws_size[idx] = val;\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n \treturn len;\t\t\t\t\t\t\t\\\n }\n", "prefixes": [ "RFC", "v3", "01/35" ] }