From owner-svn-src-stable@freebsd.org Mon Dec 2 00:39:59 2019 Return-Path: Delivered-To: svn-src-stable@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 74DD11BEA0F; Mon, 2 Dec 2019 00:39:59 +0000 (UTC) (envelope-from kib@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) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47R5qM23TSz4Rbh; Mon, 2 Dec 2019 00:39:59 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 238CD1EFEF; Mon, 2 Dec 2019 00:39:59 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id xB20dwc0059999; Mon, 2 Dec 2019 00:39:58 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id xB20dwYS059998; Mon, 2 Dec 2019 00:39:58 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201912020039.xB20dwYS059998@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Mon, 2 Dec 2019 00:39:58 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r355279 - stable/12/sys/fs/nfsclient X-SVN-Group: stable-12 X-SVN-Commit-Author: kib X-SVN-Commit-Paths: stable/12/sys/fs/nfsclient X-SVN-Commit-Revision: 355279 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Dec 2019 00:39:59 -0000 Author: kib Date: Mon Dec 2 00:39:58 2019 New Revision: 355279 URL: https://svnweb.freebsd.org/changeset/base/355279 Log: MFC r355210: In nfs_lock(), recheck vp->v_data after lock before accessing it. PR: 242184 Modified: stable/12/sys/fs/nfsclient/nfs_clvnops.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/fs/nfsclient/nfs_clvnops.c ============================================================================== --- stable/12/sys/fs/nfsclient/nfs_clvnops.c Mon Dec 2 00:11:12 2019 (r355278) +++ stable/12/sys/fs/nfsclient/nfs_clvnops.c Mon Dec 2 00:39:58 2019 (r355279) @@ -287,6 +287,8 @@ nfs_lock(struct vop_lock1_args *ap) if (error != 0 || vp->v_op != &newnfs_vnodeops) return (error); np = VTONFS(vp); + if (np == NULL) + return (0); NFSLOCKNODE(np); if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && @@ -320,6 +322,9 @@ nfs_lock(struct vop_lock1_args *ap) error = VOP_LOCK1_APV(&default_vnodeops, ap); if (error != 0 || vp->v_op != &newnfs_vnodeops) return (error); + if (vp->v_data == NULL) + goto downgrade; + MPASS(vp->v_data == np); NFSLOCKNODE(np); if ((np->n_flag & NVNSETSZSKIP) == 0) { NFSUNLOCKNODE(np);