Author: avg Date: Fri Jun 9 15:30:41 2017 New Revision: 319751 URL: https://svnweb.freebsd.org/changeset/base/319751
Log: 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 <[email protected]> Approved by: Robert Mustacchi <[email protected]> Author: loli10K <[email protected]> MFC after: 2 weeks Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c Directory Properties: head/cddl/contrib/opensolaris/ (props changed) head/cddl/contrib/opensolaris/lib/libzfs/ (props changed) Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c ============================================================================== --- head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c Fri Jun 9 15:28:57 2017 (r319750) +++ head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c Fri Jun 9 15:30:41 2017 (r319751) @@ -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) { _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
