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| author | Andriy Gapon <avg@FreeBSD.org> | 2017-06-09 15:30:41 +0000 |
|---|---|---|
| committer | Andriy Gapon <avg@FreeBSD.org> | 2017-06-09 15:30:41 +0000 |
| commit | 9260925dcdb5f7f94e35c082a511b1a14b4a9071 (patch) | |
| tree | eebafd94ce4f5677d53811ca20e52e8bbbaa2d2f /cddl | |
| parent | 667002fa279ad4c3e994dbea7019492678e1a197 (diff) | |
| parent | 1cb31ff6a482198e43465e250354d2a70ef48da3 (diff) | |
| download | src-9260925dcdb5f7f94e35c082a511b1a14b4a9071.tar.gz src-9260925dcdb5f7f94e35c082a511b1a14b4a9071.zip | |
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 <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Author: loli10K <ezomori.nozomu@gmail.com>
MFC after: 2 weeks
Notes
Notes:
svn path=/head/; revision=319751
Diffstat (limited to 'cddl')
| -rw-r--r-- | cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c index f25b744a0207..6df8cd02b8fb 100644 --- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c +++ b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c @@ -3316,6 +3316,7 @@ zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type, 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_type_t type, 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) { |