From owner-dev-commits-src-all@freebsd.org Wed Apr 21 15:07:40 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 2B8B95E8A3E; Wed, 21 Apr 2021 15:07:40 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FQP700lF4z3hHW; Wed, 21 Apr 2021 15:07:40 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 0B609325; Wed, 21 Apr 2021 15:07:40 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 13LF7dKB092373; Wed, 21 Apr 2021 15:07:39 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 13LF7dPt092372; Wed, 21 Apr 2021 15:07:39 GMT (envelope-from git) Date: Wed, 21 Apr 2021 15:07:39 GMT Message-Id: <202104211507.13LF7dPt092372@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 54f98c4dbf9b - main - vn_open_vnode(): handle error when fp == NULL MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 54f98c4dbf9b1203a4e3e1b13fd0738441226991 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Apr 2021 15:07:40 -0000 The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=54f98c4dbf9b1203a4e3e1b13fd0738441226991 commit 54f98c4dbf9b1203a4e3e1b13fd0738441226991 Author: Konstantin Belousov AuthorDate: 2021-04-19 10:25:30 +0000 Commit: Konstantin Belousov CommitDate: 2021-04-21 15:06:51 +0000 vn_open_vnode(): handle error when fp == NULL If VOP_ADD_WRITECOUNT() or adv locking failed, so VOP_CLOSE() needs to be called, we cannot use fp fo_close() when there is no fp. This occurs when e.g. kernel code directly calls vn_open() instead of the open(2) syscall. In this case, VOP_CLOSE() can be called directly, after possible lock upgrade. Reported by: nvass@gmx.com PR: 255119 Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D29830 --- sys/kern/vfs_vnops.c | 32 +++++++++++++++++++++++++------- 1 file changed, 25 insertions(+), 7 deletions(-) diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index 9da35721def4..f715c9828d04 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -451,16 +451,34 @@ vn_open_vnode(struct vnode *vp, int fmode, struct ucred *cred, /* * Error from advlock or VOP_ADD_WRITECOUNT() still requires * calling VOP_CLOSE() to pair with earlier VOP_OPEN(). - * Arrange for that by having fdrop() to use vn_closefile(). */ if (error != 0) { - fp->f_flag |= FOPENFAILED; - fp->f_vnode = vp; - if (fp->f_ops == &badfileops) { - fp->f_type = DTYPE_VNODE; - fp->f_ops = &vnops; + if (fp != NULL) { + /* + * Arrange the call by having fdrop() to use + * vn_closefile(). This is to satisfy + * filesystems like devfs or tmpfs, which + * override fo_close(). + */ + fp->f_flag |= FOPENFAILED; + fp->f_vnode = vp; + if (fp->f_ops == &badfileops) { + fp->f_type = DTYPE_VNODE; + fp->f_ops = &vnops; + } + vref(vp); + } else { + /* + * If there is no fp, due to kernel-mode open, + * we can call VOP_CLOSE() now. + */ + if (vp->v_type != VFIFO && (fmode & FWRITE) != 0 && + !MNT_EXTENDED_SHARED(vp->v_mount) && + VOP_ISLOCKED(vp) != LK_EXCLUSIVE) + vn_lock(vp, LK_UPGRADE | LK_RETRY); + (void)VOP_CLOSE(vp, fmode & (FREAD | FWRITE | FEXEC), + cred, td); } - vref(vp); } ASSERT_VOP_LOCKED(vp, "vn_open_vnode");