From owner-svn-src-stable-12@freebsd.org Mon Nov 19 00:49:09 2018 Return-Path: Delivered-To: svn-src-stable-12@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1BD2B112D406; Mon, 19 Nov 2018 00:49:09 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id B08A978E01; Mon, 19 Nov 2018 00:49:08 +0000 (UTC) (envelope-from rmacklem@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 8E7B31ADBD; Mon, 19 Nov 2018 00:49:08 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wAJ0n8wk045260; Mon, 19 Nov 2018 00:49:08 GMT (envelope-from rmacklem@FreeBSD.org) Received: (from rmacklem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wAJ0n8TG045259; Mon, 19 Nov 2018 00:49:08 GMT (envelope-from rmacklem@FreeBSD.org) Message-Id: <201811190049.wAJ0n8TG045259@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rmacklem set sender to rmacklem@FreeBSD.org using -f From: Rick Macklem Date: Mon, 19 Nov 2018 00:49:08 +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: r340590 - stable/12/sys/fs/nfsclient X-SVN-Group: stable-12 X-SVN-Commit-Author: rmacklem X-SVN-Commit-Paths: stable/12/sys/fs/nfsclient X-SVN-Commit-Revision: 340590 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B08A978E01 X-Spamd-Result: default: False [0.35 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_SPAM_MEDIUM(0.12)[0.116,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_SPAM_SHORT(0.24)[0.236,0] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Nov 2018 00:49:09 -0000 Author: rmacklem Date: Mon Nov 19 00:49:08 2018 New Revision: 340590 URL: https://svnweb.freebsd.org/changeset/base/340590 Log: MFC: r339999 Fix NFS client vnode locking to avoid a crash during forced dismount. A crash was reported where the crash occurred in nfs_advlock() when the NFS_ISV4(vp) macro was being executed. This was caused by the vnode being VI_DOOMED due to a forced dismount in progress. This patch fixes the problem by locking the vnode before executing the NFS_ISV4() macro. PR: 232673 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 Sun Nov 18 23:48:15 2018 (r340589) +++ stable/12/sys/fs/nfsclient/nfs_clvnops.c Mon Nov 19 00:49:08 2018 (r340590) @@ -3008,14 +3008,19 @@ nfs_advlock(struct vop_advlock_args *ap) int ret, error = EOPNOTSUPP; u_quad_t size; + ret = NFSVOPLOCK(vp, LK_SHARED); + if (ret != 0) + return (EBADF); if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { - if (vp->v_type != VREG) + if (vp->v_type != VREG) { + NFSVOPUNLOCK(vp, 0); return (EINVAL); + } if ((ap->a_flags & F_POSIX) != 0) cred = p->p_ucred; else cred = td->td_ucred; - NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); + NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); if (vp->v_iflag & VI_DOOMED) { NFSVOPUNLOCK(vp, 0); return (EBADF); @@ -3094,9 +3099,6 @@ nfs_advlock(struct vop_advlock_args *ap) NFSVOPUNLOCK(vp, 0); return (0); } else if (!NFS_ISV4(vp)) { - error = NFSVOPLOCK(vp, LK_SHARED); - if (error) - return (error); if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { size = VTONFS(vp)->n_size; NFSVOPUNLOCK(vp, 0); @@ -3119,7 +3121,8 @@ nfs_advlock(struct vop_advlock_args *ap) NFSVOPUNLOCK(vp, 0); } } - } + } else + NFSVOPUNLOCK(vp, 0); return (error); }