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GET /api/1.1/patches/2229581/?format=api
{ "id": 2229581, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229581/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260428131756.922303-10-dhowells@redhat.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/1.1/projects/12/?format=api", "name": "Linux CIFS Client", "link_name": "linux-cifs-client", "list_id": "linux-cifs.vger.kernel.org", "list_email": "linux-cifs@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260428131756.922303-10-dhowells@redhat.com>", "date": "2026-04-28T13:17:39", "name": "[v5,09/24] netfs: Fix overrun check in netfs_extract_user_iter()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "8c155336f3086e410f0ddeea14ba23fd1c3976fe", "submitter": { "id": 59, "url": "http://patchwork.ozlabs.org/api/1.1/people/59/?format=api", "name": "David Howells", "email": "dhowells@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260428131756.922303-10-dhowells@redhat.com/mbox/", "series": [ { "id": 501852, "url": "http://patchwork.ozlabs.org/api/1.1/series/501852/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501852", "date": "2026-04-28T13:17:35", "name": "netfs: Miscellaneous fixes", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/501852/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2229581/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229581/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-cifs+bounces-11203-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-cifs@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=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=PoK3+Ude;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1777382369;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=bHSQahnA7js1P4paGsZUSZ9WNRs6QCvVJJSxiV11wQI=;\n\tb=PoK3+Udej8Hpqibeltoe9U6qxEQ2eo/0TpB8AR01gIsB5+A7kVEcVMzXV65N7k8ZGCkmzI\n\tp29ScDih9LqR3MXEi6Zj5rRSZ/pV/4jjQrVqOO2VTzxKrPVBRXNcPgdiISiZkZZi47t5KK\n\tmA06ev1UFZuTwoc82fd7MwjOpQ6NmJI=", "X-MC-Unique": "4t6aizAbP86H_MufK2aZGw-1", "X-Mimecast-MFC-AGG-ID": "4t6aizAbP86H_MufK2aZGw_1777382362", "From": "David Howells <dhowells@redhat.com>", "To": "Christian Brauner <christian@brauner.io>", "Cc": "David Howells <dhowells@redhat.com>,\n\tPaulo Alcantara <pc@manguebit.org>,\n\tnetfs@lists.linux.dev,\n\tlinux-afs@lists.infradead.org,\n\tlinux-cifs@vger.kernel.org,\n\tceph-devel@vger.kernel.org,\n\tlinux-fsdevel@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Subject": "[PATCH v5 09/24] netfs: Fix overrun check in\n netfs_extract_user_iter()", "Date": "Tue, 28 Apr 2026 14:17:39 +0100", "Message-ID": "<20260428131756.922303-10-dhowells@redhat.com>", "In-Reply-To": "<20260428131756.922303-1-dhowells@redhat.com>", "References": "<20260428131756.922303-1-dhowells@redhat.com>", "Precedence": "bulk", "X-Mailing-List": "linux-cifs@vger.kernel.org", "List-Id": "<linux-cifs.vger.kernel.org>", "List-Subscribe": "<mailto:linux-cifs+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-cifs+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.0 on 10.30.177.12" }, "content": "Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills\npages[], then those pages don't get included in the iterator constructed at\nthe end of the function. If there was an overfill, memory corruption has\nalready happened.\n\nFixes: 85dd2c8ff368 (\"netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator\")\nCloses: https://sashiko.dev/#/patchset/20260427154639.180684-1-dhowells%40redhat.com\nSigned-off-by: David Howells <dhowells@redhat.com>\ncc: Paulo Alcantara <pc@manguebit.org>\ncc: netfs@lists.linux.dev\ncc: linux-fsdevel@vger.kernel.org\n---\n fs/netfs/iterator.c | 21 ++++++++++++---------\n 1 file changed, 12 insertions(+), 9 deletions(-)", "diff": "diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c\nindex adca78747f23..932f745fa3b5 100644\n--- a/fs/netfs/iterator.c\n+++ b/fs/netfs/iterator.c\n@@ -72,21 +72,24 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,\n \t\t\tbreak;\n \t\t}\n \n-\t\tif (ret > count) {\n-\t\t\tpr_err(\"get_pages rc=%zd more than %zu\\n\", ret, count);\n+\t\tif (WARN(ret > count,\n+\t\t\t \"%s: extract_pages overrun %zd > %zu bytes\\n\",\n+\t\t\t __func__, ret, count)) {\n+\t\t\tret = -EIO;\n \t\t\tbreak;\n \t\t}\n \n-\t\tcount -= ret;\n-\t\tret += offset;\n-\t\tcur_npages = DIV_ROUND_UP(ret, PAGE_SIZE);\n-\n-\t\tif (npages + cur_npages > max_pages) {\n-\t\t\tpr_err(\"Out of bvec array capacity (%u vs %u)\\n\",\n-\t\t\t npages + cur_npages, max_pages);\n+\t\tcur_npages = DIV_ROUND_UP(offset + ret, PAGE_SIZE);\n+\t\tif (WARN(cur_npages > max_pages - npages,\n+\t\t\t \"%s: extract_pages overrun %u > %u pages\\n\",\n+\t\t\t __func__, npages + cur_npages, max_pages)) {\n+\t\t\tret = -EIO;\n \t\t\tbreak;\n \t\t}\n \n+\t\tcount -= ret;\n+\t\tret += offset;\n+\n \t\tfor (i = 0; i < cur_npages; i++) {\n \t\t\tlen = ret > PAGE_SIZE ? PAGE_SIZE : ret;\n \t\t\tbvec_set_page(bv + npages + i, *pages++, len - offset, offset);\n", "prefixes": [ "v5", "09/24" ] }