{"id":2223942,"url":"http://patchwork.ozlabs.org/api/covers/2223942/?format=json","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=json","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":"","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=json","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=json","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":"","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; 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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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"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(-)"}