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GET /api/1.1/patches/2229602/?format=api
{ "id": 2229602, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229602/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260428131756.922303-18-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": "<20260428131756.922303-18-dhowells@redhat.com>", "date": "2026-04-28T13:17:47", "name": "[v5,17/24] netfs: Fix early put of sink folio in netfs_read_gaps()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ad68f0343b90b0c13fcf67c157fe845ccf1ce4d4", "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/20260428131756.922303-18-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/2229602/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229602/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-cifs+bounces-11202-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=KSanz9Wp;\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; 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a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777382372; cv=none;\n b=il7bTX54tsggaMewGG1xoDs4kHyYJI4qAX24eWaXNJ1KTRAneBtpMXTGxXLq9+mw2SqMtBhv92jOpCkf5cSG6cqHF67YYxXUwbIFoQgIfDpC6mbeSaKSAOYu2QIqTix4M6QJvjl9BkFXJIwp2sowUlA8su9asvsok11JGNzrqAk=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777382372; c=relaxed/simple;\n\tbh=J6xbkiUXEBxqGua30Ly2BO3cTSDIQVPMlA1JsgMbaAg=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=e262ga+ucg4QSYQH/eRG2MF+N6AUlHviRksa+JMY6FhnGDluOnMXFQG91Q68yx3/wAbnRR7h3VMxh80ABUmKAlkg0rd67UxesahYdBu/DIPq40dH5FRizdUNiCeOekJRp1+murA0ntSjHbQSWOBXdR5lfsSZDDqARmbVPEL+AJo=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=redhat.com;\n spf=pass smtp.mailfrom=redhat.com;\n dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com\n header.b=KSanz9Wp; arc=none smtp.client-ip=170.10.129.124", "DKIM-Signature": "v=1; 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=zPw8vG2tI8x7LyUiAgQo8fFB7ZuQxgP71N5NQ3zP9Ok=;\n\tb=KSanz9Wp+A9ypRMVQM6BulZHNRXdwDEsR23r6pOQ6HZ2QC1ErSakf6vyJPrUE7Icbu2Zbl\n\tDqnZVne6AXydq9fMAt/YHfFjF3WzU7K5udTkRnQndM4NdMVJBUWrI9ylsQooFIh8oz6+zA\n\t2tvbw/hZy2CA7U/YwUoWaKf4GM6SDkY=", "X-MC-Unique": "KETjkhGDMKu4F8BaFxma3A-1", "X-Mimecast-MFC-AGG-ID": "KETjkhGDMKu4F8BaFxma3A_1777382365", "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,\n\tSteve French <sfrench@samba.org>,\n\tMatthew Wilcox <willy@infradead.org>", "Subject": "[PATCH v5 17/24] netfs: Fix early put of sink folio in\n netfs_read_gaps()", "Date": "Tue, 28 Apr 2026 14:17:47 +0100", "Message-ID": "<20260428131756.922303-18-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_read_gaps() to release the sink page it uses after waiting for\nthe request to complete. The way the sink page is used is that an\nITER_BVEC-class iterator is created that has the gaps from the target folio\nat either end, but has the sink page tiled over the middle so that a single\nread op can fill in both gaps.\n\nThe bug was found by KASAN detecting a UAF on the generic/075 xfstest in\nthe cifsd kernel thread that handles reception of data from the TCP socket:\n\n BUG: KASAN: use-after-free in _copy_to_iter+0x48a/0xa20\n Write of size 885 at addr ffff888107f92000 by task cifsd/1285\n CPU: 2 UID: 0 PID: 1285 Comm: cifsd Not tainted 7.0.0 #6 PREEMPT(lazy)\n Call Trace:\n dump_stack_lvl+0x5d/0x80\n print_report+0x17f/0x4f1\n kasan_report+0x100/0x1e0\n kasan_check_range+0x10f/0x1e0\n __asan_memcpy+0x3c/0x60\n _copy_to_iter+0x48a/0xa20\n __skb_datagram_iter+0x2c9/0x430\n skb_copy_datagram_iter+0x6e/0x160\n tcp_recvmsg_locked+0xce0/0x1130\n tcp_recvmsg+0xeb/0x300\n inet_recvmsg+0xcf/0x3a0\n sock_recvmsg+0xea/0x100\n cifs_readv_from_socket+0x3a6/0x4d0 [cifs]\n cifs_read_iter_from_socket+0xdd/0x130 [cifs]\n cifs_readv_receive+0xaad/0xb10 [cifs]\n cifs_demultiplex_thread+0x1148/0x1740 [cifs]\n kthread+0x1cf/0x210\n\nFixes: ee4cdf7ba857 (\"netfs: Speed up buffered reading\")\nReported-by: Steve French <sfrench@samba.org>\nSigned-off-by: David Howells <dhowells@redhat.com>\nReviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>\ncc: Paulo Alcantara <pc@manguebit.org>\ncc: Matthew Wilcox <willy@infradead.org>\ncc: netfs@lists.linux.dev\ncc: linux-fsdevel@vger.kernel.org\n---\n fs/netfs/buffered_read.c | 6 +++---\n 1 file changed, 3 insertions(+), 3 deletions(-)", "diff": "diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c\nindex c0a7f9e60f0c..18c8e00626c9 100644\n--- a/fs/netfs/buffered_read.c\n+++ b/fs/netfs/buffered_read.c\n@@ -457,9 +457,6 @@ static int netfs_read_gaps(struct file *file, struct folio *folio)\n \n \tnetfs_read_to_pagecache(rreq, NULL);\n \n-\tif (sink)\n-\t\tfolio_put(sink);\n-\n \tret = netfs_wait_for_read(rreq);\n \tif (ret >= 0) {\n \t\tif (group)\n@@ -471,6 +468,9 @@ static int netfs_read_gaps(struct file *file, struct folio *folio)\n \t\tflush_dcache_folio(folio);\n \t\tfolio_mark_uptodate(folio);\n \t}\n+\n+\tif (sink)\n+\t\tfolio_put(sink);\n \tfolio_unlock(folio);\n \tnetfs_put_request(rreq, netfs_rreq_trace_put_return);\n \treturn ret < 0 ? ret : 0;\n", "prefixes": [ "v5", "17/24" ] }