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Fix potential use-after-frees in FreeBSD getpages and setattr VOPs 

The objset object is reallocated during certain dataset operations, such
as rollbacks, so the objset pointer must be loaded after acquiring the
teardown lock.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Closes #12704
This commit is contained in:
Mark Johnston 2021-10-28 11:58:57 -04:00 committed by Tony Hutter
parent 4bbffa2489
commit d94d1a589c
1 changed files with 4 additions and 4 deletions
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8
module/os/freebsd/zfs/zfs_vnops_os.c
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@ -2222,7 +2222,7 @@ zfs_setattr(znode_t *zp, vattr_t *vap, int flags, cred_t *cr)
{
vnode_t *vp = ZTOV(zp);
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
objset_t *os = zfsvfs->z_os;
objset_t *os;
zilog_t *zilog;
dmu_tx_t *tx;
vattr_t oldva;
@ -2257,6 +2257,7 @@ zfs_setattr(znode_t *zp, vattr_t *vap, int flags, cred_t *cr)
ZFS_ENTER(zfsvfs);
ZFS_VERIFY_ZP(zp);
os = zfsvfs->z_os;
zilog = zfsvfs->z_log;
/*
@ -4058,7 +4059,6 @@ zfs_getpages(struct vnode *vp, vm_page_t *ma, int count, int *rbehind,
{
znode_t *zp = VTOZ(vp);
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
objset_t *os = zp->z_zfsvfs->z_os;
zfs_locked_range_t *lr;
vm_object_t object;
off_t start, end, obj_size;
@ -4128,8 +4128,8 @@ zfs_getpages(struct vnode *vp, vm_page_t *ma, int count, int *rbehind,
* ZFS will panic if we request DMU to read beyond the end of the last
* allocated block.
*/
error = dmu_read_pages(os, zp->z_id, ma, count, &pgsin_b, &pgsin_a,
MIN(end, obj_size) - (end - PAGE_SIZE));
error = dmu_read_pages(zfsvfs->z_os, zp->z_id, ma, count, &pgsin_b,
&pgsin_a, MIN(end, obj_size) - (end - PAGE_SIZE));
if (lr != NULL)
zfs_rangelock_exit(lr);