From owner-svn-src-stable@freebsd.org Wed Jul 26 17:46:07 2017 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6F8D3DABC70; Wed, 26 Jul 2017 17:46:07 +0000 (UTC) (envelope-from mav@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 mx1.freebsd.org (Postfix) with ESMTPS id 467F36EFF3; Wed, 26 Jul 2017 17:46:07 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v6QHk61h003373; Wed, 26 Jul 2017 17:46:06 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v6QHk6vQ003372; Wed, 26 Jul 2017 17:46:06 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201707261746.v6QHk6vQ003372@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Wed, 26 Jul 2017 17:46:06 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r321576 - stable/11/cddl/contrib/opensolaris/lib/libzfs/common X-SVN-Group: stable-11 X-SVN-Commit-Author: mav X-SVN-Commit-Paths: stable/11/cddl/contrib/opensolaris/lib/libzfs/common X-SVN-Commit-Revision: 321576 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: 2.1.23 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: Wed, 26 Jul 2017 17:46:07 -0000 Author: mav Date: Wed Jul 26 17:46:06 2017 New Revision: 321576 URL: https://svnweb.freebsd.org/changeset/base/321576 Log: MFC r319751: MFV r319740: 8168 NULL pointer dereference in zfs_create() illumos/illumos-gate@690031d326342fa4ea28b5e80f1ad6a16281519d https://github.com/illumos/illumos-gate/commit/690031d326342fa4ea28b5e80f1ad6a16281519d https://www.illumos.org/issues/8168 If we manage to export the pool on which we are creating a dataset (filesystem or zvol) between entering libzfs`zfs_create() and libzfs`zpool_open() call (for which we never check the return value) we end up dereferencing a NULL pointer in libzfs`zpool_close(). This was discovered on ZFS on Linux. The same issue can be reproduced on Illumos running in parallel: while :; do zpool import -d /tmp testpool ; zpool export testpool ; done while :; do zfs create testpool/fs; zfs destroy testpool/fs ; done Eventually this will result in several core dumps like this one: [root@52-54-00-d3-7a-01 /cores]# mdb core.zfs.4244 Loading modules: [ libumem.so.1 libc.so.1 libtopo.so.1 libavl.so.1 libnvpair.so.1 ld.so.1 ] > ::stack libzfs.so.1`zpool_close+0x17(0, 0, 0, 8047450) libzfs.so.1`zfs_create+0x1bb(8090548, 8047e6f, 1, 808cba8) zfs_do_create+0x545(2, 8047d74, 80778a0, 801, 0, 3) main+0x22c(8047d2c, fef5c6e8, 8047d64, 8055a17, 3, 8047d70) _start+0x83(3, 8047e64, 8047e68, 8047e6f, 0, 8047e7b) > Fix and reproducer (systemtap): https://github.com/zfsonlinux/zfs/pull/6096 Reviewed by: Matt Ahrens Approved by: Robert Mustacchi Author: loli10K Modified: stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c Directory Properties: stable/11/ (props changed) Modified: stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c ============================================================================== --- stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c Wed Jul 26 17:45:09 2017 (r321575) +++ stable/11/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c Wed Jul 26 17:46:06 2017 (r321576) @@ -3316,6 +3316,7 @@ zfs_create(libzfs_handle_t *hdl, const char *path, zfs char errbuf[1024]; uint64_t zoned; enum lzc_dataset_type ost; + zpool_handle_t *zpool_handle; (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, "cannot create '%s'"), path); @@ -3355,7 +3356,8 @@ zfs_create(libzfs_handle_t *hdl, const char *path, zfs if (p != NULL) *p = '\0'; - zpool_handle_t *zpool_handle = zpool_open(hdl, pool_path); + if ((zpool_handle = zpool_open(hdl, pool_path)) == NULL) + return (-1); if (props && (props = zfs_valid_proplist(hdl, type, props, zoned, NULL, zpool_handle, errbuf)) == 0) {