Cover Letter Detail
Show a cover letter.
GET /api/covers/2223942/?format=api
{ "id": 2223942, "url": "http://patchwork.ozlabs.org/api/covers/2223942/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/cover/cover.1776340676.git.saviram@nvidia.com/", "project": { "id": 15, "url": "http://patchwork.ozlabs.org/api/projects/15/?format=api", "name": "Ubuntu Kernel", "link_name": "ubuntu-kernel", "list_id": "kernel-team.lists.ubuntu.com", "list_email": "kernel-team@lists.ubuntu.com", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<cover.1776340676.git.saviram@nvidia.com>", "list_archive_url": null, "date": "2026-04-16T12:14:04", "name": "[SRU,N:linux-bluefield,v1,0/2] UBUNTU: SAUCE: vfio: Export vfio device get and put registration helpers", "submitter": { "id": 91107, "url": "http://patchwork.ozlabs.org/api/people/91107/?format=api", "name": "Stav Aviram", "email": "saviram@nvidia.com" }, "mbox": "http://patchwork.ozlabs.org/project/ubuntu-kernel/cover/cover.1776340676.git.saviram@nvidia.com/mbox/", "series": [ { "id": 500146, "url": "http://patchwork.ozlabs.org/api/series/500146/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=500146", "date": "2026-04-16T12:14:04", "name": "UBUNTU: SAUCE: vfio: Export vfio device get and put registration helpers", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500146/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2223942/comments/", "headers": { "Return-Path": "<kernel-team-bounces@lists.ubuntu.com>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=NfxdnN1h;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxH596dcZz1yCv\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 16 Apr 2026 22:14:53 +1000 (AEST)", "from localhost ([127.0.0.1] helo=lists.ubuntu.com)\n\tby lists.ubuntu.com with esmtp (Exim 4.86_2)\n\t(envelope-from <kernel-team-bounces@lists.ubuntu.com>)\n\tid 1wDLcH-0002Sz-JM; Thu, 16 Apr 2026 12:14:41 +0000", "from mail-westus3azon11010054.outbound.protection.outlook.com\n ([52.101.201.54] helo=PH7PR06CU001.outbound.protection.outlook.com)\n by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.86_2) (envelope-from <saviram@nvidia.com>)\n id 1wDLcG-0002Sj-Ao\n for kernel-team@lists.ubuntu.com; Thu, 16 Apr 2026 12:14:40 +0000", "from BY5PR17CA0069.namprd17.prod.outlook.com (2603:10b6:a03:167::46)\n by CY5PR12MB6429.namprd12.prod.outlook.com (2603:10b6:930:3b::16)\n with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9818.20; Thu, 16 Apr\n 2026 12:14:32 +0000", "from SJ1PEPF00001CE2.namprd05.prod.outlook.com\n (2603:10b6:a03:167:cafe::b5) by BY5PR17CA0069.outlook.office365.com\n (2603:10b6:a03:167::46) with Microsoft SMTP Server (version=TLS1_3,\n cipher=TLS_AES_256_GCM_SHA384) id 15.20.9769.51 via Frontend Transport; Thu,\n 16 Apr 2026 12:14:32 +0000", "from mail.nvidia.com (216.228.117.161) by\n SJ1PEPF00001CE2.mail.protection.outlook.com (10.167.242.10) with Microsoft\n SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n 15.20.9769.17 via Frontend Transport; Thu, 16 Apr 2026 12:14:31 +0000", "from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com\n (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Thu, 16 Apr\n 2026 05:14:22 -0700", "from mtl-vdi-959.wap.labs.mlnx (10.126.230.37) by\n rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server\n (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id\n 15.2.2562.20; Thu, 16 Apr 2026 05:14:21 -0700" ], "ARC-Seal": "i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none;\n b=Cope71a7vUUBZhaS3CcgCPBKikmqbaDqJfVzrPr+18lsUVJVJSu1p3cWC+KjE2URvY+It/vuZpcu7ZrzRVoBofxdeMrS6jsPgQBfkdu60l6UPg7vPjT8KMPM5CDpVbySYHcNt2jDSEj5RmV83cDcssFRfn06fbfLYH5oRf8RtFySKkAZn7DSlhJs4U4fV+1R8C27jZM+72oWvMAzP/Bpqm051LMom4vk+/gpugVx+cDo6doAd4oOGZSe/nvu/koRFeGWQYxGGsKP2iIiqT1mbT7OyQbo8nzuv9FYaObvJGue139fJ7wfOByQFitp0niH102EZt6G5Mw7LMwD+3j+QQ==", "ARC-Message-Signature": "i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;\n s=arcselector10001;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;\n bh=s/ek1xhYgKYi/cpeb5zKRJQqznSbGrVAqhY0St+8F1g=;\n b=oaKmfhYjomKiLLBQqccBRT8P/Timb8HuVzPrS6YVFulLUvUEBgipAQjCxO+6XkwPQ4MU3OMgwQqIPvpvTHrP4H79ja9emN+pb9xeNYPbQHc1JijlUbmlmFwk/NHsA35tgW8EQ1aQJ1TtJK8uw/nTFkUSeDWvAcL5IH1FuBs1O/4hrLOUJK8k3bte+Dv27MsFBmXF+w9O7oWmjIR7AKItriavcS1Bb2oJWuwlhEbzLc20r3qPE2gf3KxywvhesznuwWnqNEhdXcuCEiFnuB/e3sjo8QodSwJ1HHvIbcjYbn8bN8KYl+0aI2PpLSWSfJHjj/8lcBcMeZS2Hhrib0btCA==", "ARC-Authentication-Results": "i=1; mx.microsoft.com 1; spf=pass (sender ip is\n 216.228.117.161) smtp.rcpttodomain=lists.ubuntu.com smtp.mailfrom=nvidia.com;\n dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com;\n dkim=none (message not signed); arc=none (0)", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com;\n s=selector2;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=s/ek1xhYgKYi/cpeb5zKRJQqznSbGrVAqhY0St+8F1g=;\n b=NfxdnN1hKbzgDPykk8GSyh398iFQ+pPN9GEb5jbsO1Ad5Lh/eEmMlcNJ4uFpGBrX9h1Bpr9qKXZYtVd1CMkgtBZqWe7ZUsGUtGKM2h9pEUmcbm0CkBXgttt7iKzhA3X3lqbzhiiM9VYwVr9YbSl/s4jqusLIyd1IWG0L04alPTkv5WYq63qs4LMVslt6bcLyN+DBsjJcb0m8/jWQTUWrzWveyyRszsq8mO6NmDeoEjKhOCK4ohsqVXQMrR7rULPIqAlsafQaXNv9IDx1ocNw/+g/EJowj9wzvC+JsD+ZIcqz5cVB9m1o7gwr3uvOtGMUjihjL0I3xqw975ifcgO13Q==", "X-MS-Exchange-Authentication-Results": "spf=pass (sender IP is 216.228.117.161)\n smtp.mailfrom=nvidia.com;\n dkim=none (message not signed)\n header.d=none;dmarc=pass action=none header.from=nvidia.com;", "Received-SPF": [ "Pass (protection.outlook.com: domain of nvidia.com designates\n 216.228.117.161 as permitted sender) receiver=protection.outlook.com;\n client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C", "permerror client-ip=52.101.201.54;\n envelope-from=saviram@nvidia.com;\n helo=PH7PR06CU001.outbound.protection.outlook.com" ], "From": "Stav Aviram <saviram@nvidia.com>", "To": "<kernel-team@lists.ubuntu.com>", "Subject": "[SRU][N:linux-bluefield][PATCH v1 0/2] UBUNTU: SAUCE: vfio: Export\n vfio device get and put registration helpers", "Date": "Thu, 16 Apr 2026 15:14:04 +0300", "Message-ID": "<cover.1776340676.git.saviram@nvidia.com>", "X-Mailer": "git-send-email 2.47.0", "MIME-Version": "1.0", "X-Originating-IP": "[10.126.230.37]", "X-ClientProxiedBy": "rnnvmail202.nvidia.com (10.129.68.7) To\n rnnvmail201.nvidia.com (10.129.68.8)", "X-EOPAttributedMessage": "0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "SJ1PEPF00001CE2:EE_|CY5PR12MB6429:EE_", "X-MS-Office365-Filtering-Correlation-Id": "e31174df-5bbe-4963-f2dc-08de9bb1b731", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;\n ARA:13230040|1800799024|36860700016|82310400026|376014|56012099003|18002099003|13003099007;", "X-Microsoft-Antispam-Message-Info": "\n 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", "X-Forefront-Antispam-Report": "CIP:216.228.117.161; CTRY:US; LANG:en; SCL:1;\n SRV:;\n IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge2.nvidia.com; CAT:NONE;\n SFS:(13230040)(1800799024)(36860700016)(82310400026)(376014)(56012099003)(18002099003)(13003099007);\n DIR:OUT; SFP:1101;", "X-MS-Exchange-AntiSpam-MessageData-ChunkCount": "1", "X-MS-Exchange-AntiSpam-MessageData-0": "\n x9RLIQqjFzJyUIJh7NZvq/zTDbMiNPF1h7IfRZxzthTaln3SLL+rGrCBNajzMakZxyZp0s6JqYCnjge6/i3Bruod9VKvPtLM9cH3fs26wt2oprgKvwviqscIu6Rsue+c6Xvt4KbckBgVJla5fqH8+QRRlQrsmsMfWR6mrVN4fPzQM+3CRpXvh8qcaekl5Sm3FMoQRTnHbXO/F4/pyqwnkehNwjDe/GiSrZWM+tVyjqDI+l860ZX3wTy2eicR41rt4eQYWFqA7TVwzC9OrS3K2tMencioRhF9W0Hyt1YlicVZ4VCGCiSpg5WIzH8mfZsbFyRkxitW4Mcqs9XX8KNhMhivrL0oheVSdqrXCczE/spk1lZyVaZgWOVogmk6jyMaFW7i+LNZhLO1O/D45Nu8l2uYxW4PuOjddugEM4kQIRnMi5I0FO+nNUHPrIC4cMn6", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "16 Apr 2026 12:14:31.8060 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n e31174df-5bbe-4963-f2dc-08de9bb1b731", "X-MS-Exchange-CrossTenant-Id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.161];\n Helo=[mail.nvidia.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n SJ1PEPF00001CE2.namprd05.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "CY5PR12MB6429", "X-BeenThere": "kernel-team@lists.ubuntu.com", "X-Mailman-Version": "2.1.20", "Precedence": "list", "List-Id": "Kernel team discussions <kernel-team.lists.ubuntu.com>", "List-Unsubscribe": "<https://lists.ubuntu.com/mailman/options/kernel-team>,\n <mailto:kernel-team-request@lists.ubuntu.com?subject=unsubscribe>", "List-Archive": "<https://lists.ubuntu.com/archives/kernel-team>", "List-Post": "<mailto:kernel-team@lists.ubuntu.com>", "List-Help": "<mailto:kernel-team-request@lists.ubuntu.com?subject=help>", "List-Subscribe": "<https://lists.ubuntu.com/mailman/listinfo/kernel-team>,\n <mailto:kernel-team-request@lists.ubuntu.com?subject=subscribe>", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "kernel-team-bounces@lists.ubuntu.com", "Sender": "\"kernel-team\" <kernel-team-bounces@lists.ubuntu.com>" }, "content": "BugLink: https://bugs.launchpad.net/bugs/2148554\n\nSRU Justification:\n\n[IMPACT]\nA kernel NULL pointer dereference occurs on Nvidia BlueField DPUs running Ubuntu 24.04\n(Noble) with linux-bluefield-6.8. The crash is triggered when closing a dma_buf file\ndescriptor associated with a vfio_pci device. The root cause is that\nvfio_pci_dma_buf_release() and vfio_pci_dma_buf_cleanup() call vfio_put_device() to\nrelease a reference, but the reference was acquired with vfio_device_get(), which uses\na separate refcount (device->refcount). Using vfio_put_device() incorrectly decrements\nthe kobject refcount, triggering a refcount underflow and kernel crash.\n\n[FIX]\nTwo custom patches are submitted:\n- UBUNTU: SAUCE: vfio: Export vfio device get and put registration helpers — exports\n vfio_device_try_get_registration and vfio_device_put_registration via\n EXPORT_SYMBOL_GPL in vfio_main.c and adds their declarations to vfio.h, making them\n available to other VFIO modules.\n- UBUNTU: SAUCE: vfio/pci: Use the correct ref count — fixes\n vfio_pci_dma_buf_release() and vfio_pci_dma_buf_cleanup() to call\n vfio_device_put_registration() instead of vfio_put_device(), correctly matching the\n reference acquisition done via vfio_device_get().\n\n[TEST CASE]\nCompile tested on linux-bluefield-6.8 on the master-next branch.\nFunctionally verified: the NULL pointer dereference no longer reproduces after applying\nthe fix.\n\n[Regression Potential]\nLow. The change corrects an incorrect function call in the release path, and the fix\nhas been functionally verified on the affected setup.\n\nAmir Tzin (1):\n UBUNTU: SAUCE: vfio/pci: Use the correct ref count\n\nVivek Kasireddy (1):\n UBUNTU: SAUCE: vfio: Export vfio device get and put registration\n helpers\n\n drivers/vfio/pci/dma_buf.c | 4 ++--\n drivers/vfio/vfio_main.c | 2 ++\n include/linux/vfio.h | 2 ++\n 3 files changed, 6 insertions(+), 2 deletions(-)" }