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GET /api/patches/2227624/?format=api
{ "id": 2227624, "url": "http://patchwork.ozlabs.org/api/patches/2227624/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260424025547.3806072-3-songmuchun@bytedance.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/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": "<20260424025547.3806072-3-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260424025547.3806072-3-songmuchun@bytedance.com/", "date": "2026-04-24T02:55:42", "name": "[v6,2/7] mm/memory_hotplug: Fix incorrect altmap passing in error path", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ba7653b51e9a580a78fa4faab5ace07cee5635d3", "submitter": { "id": 78930, "url": "http://patchwork.ozlabs.org/api/people/78930/?format=api", "name": "Muchun Song", "email": "songmuchun@bytedance.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260424025547.3806072-3-songmuchun@bytedance.com/mbox/", "series": [ { "id": 501285, "url": "http://patchwork.ozlabs.org/api/series/501285/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=501285", "date": "2026-04-24T02:55:40", "name": "mm: fix vmemmap optimization accounting and initialization", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/501285/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2227624/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227624/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20028-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=bytedance.com header.i=@bytedance.com\n header.a=rsa-sha256 header.s=google header.b=UQA31Yo9;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Howlett\" <Liam.Howlett@oracle.com>,\n\tVlastimil Babka <vbabka@kernel.org>,\n\tMike Rapoport <rppt@kernel.org>,\n\tSuren Baghdasaryan <surenb@google.com>,\n\tMichal Hocko <mhocko@suse.com>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\tChristophe Leroy <chleroy@kernel.org>,\n\taneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com,\n\tlinux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-kernel@vger.kernel.org,\n\tMuchun Song <songmuchun@bytedance.com>,\n\tstable@vger.kernel.org", "Subject": "[PATCH v6 2/7] mm/memory_hotplug: Fix incorrect altmap passing in\n error path", "Date": "Fri, 24 Apr 2026 10:55:42 +0800", "Message-Id": "<20260424025547.3806072-3-songmuchun@bytedance.com>", "X-Mailer": "git-send-email 2.20.1", "In-Reply-To": "<20260424025547.3806072-1-songmuchun@bytedance.com>", "References": "<20260424025547.3806072-1-songmuchun@bytedance.com>", "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-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,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": "In create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds\nwith memmap_on_memory enabled, the vmemmap pages are allocated from\nparams.altmap. If create_memory_block_devices() subsequently fails, the\nerror path calls arch_remove_memory() with a NULL altmap instead of\nparams.altmap.\n\nThis is a bug that could lead to memory corruption. Since altmap is\nNULL, vmemmap_free() falls back to freeing the vmemmap pages into the\nsystem buddy allocator via free_pages() instead of the altmap.\narch_remove_memory() then immediately destroys the physical linear\nmapping for this memory. This injects unowned pages into the buddy\nallocator, causing machine checks or memory corruption if the system\nlater attempts to allocate and use those freed pages.\n\nFix this by passing params.altmap to arch_remove_memory() in the error\npath.\n\nFixes: 6b8f0798b85a (\"mm/memory_hotplug: split memmap_on_memory requests across memblocks\")\nCc: stable@vger.kernel.org\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\nAcked-by: David Hildenbrand (Arm) <david@kernel.org>\n---\n mm/memory_hotplug.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)", "diff": "diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c\nindex 2a943ec57c85..0bad2aed2bde 100644\n--- a/mm/memory_hotplug.c\n+++ b/mm/memory_hotplug.c\n@@ -1468,7 +1468,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group,\n \t\tret = create_memory_block_devices(cur_start, memblock_size, nid,\n \t\t\t\t\t\t params.altmap, group);\n \t\tif (ret) {\n-\t\t\tarch_remove_memory(cur_start, memblock_size, NULL);\n+\t\t\tarch_remove_memory(cur_start, memblock_size, params.altmap);\n \t\t\tkfree(params.altmap);\n \t\t\tgoto out;\n \t\t}\n", "prefixes": [ "v6", "2/7" ] }