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Fix some FreeBSD VOPs to synchronize properly with teardown #12704

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Fix some FreeBSD VOPs to synchronize properly with teardown #12704

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9b76db0
Fix potential use-after-frees in FreeBSD getpages and setattr VOPs
markjdb Oct 28, 2021
37185e7
Exit the teardown section later in rename on FreeBSD
markjdb Oct 28, 2021
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15 changes: 8 additions & 7 deletions module/os/freebsd/zfs/zfs_vnops_os.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2208,7 +2208,7 @@ 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;
Expand Down Expand Up @@ -2243,6 +2243,7 @@ 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;

/*
Expand Down Expand Up @@ -3430,7 +3431,6 @@ zfs_rename_(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
dmu_tx_commit(tx);

unlockout: /* all 4 vnodes are locked, ZFS_ENTER called */
ZFS_EXIT(zfsvfs);
if (want_seqc_end) {
vn_seqc_write_end(*svpp);
vn_seqc_write_end(sdvp);
Expand All @@ -3443,10 +3443,12 @@ zfs_rename_(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
VOP_UNLOCK1(*svpp);
VOP_UNLOCK1(sdvp);

out: /* original two vnodes are locked */
MPASS(!want_seqc_end);
if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, 0);
ZFS_EXIT(zfsvfs);

out: /* original two vnodes are locked */
MPASS(!want_seqc_end);

if (*tvpp != NULL)
VOP_UNLOCK1(*tvpp);
Expand Down Expand Up @@ -4046,7 +4048,6 @@ 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;
Expand Down Expand Up @@ -4116,8 +4117,8 @@ 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);
Expand Down