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Fix unprotected zfs_znode_dmu_fini

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In original code, zfs_znode_dmu_fini is called in zfs_rmnode without
zfs_znode_hold_enter. It seems to assume it's ok to do so when the znode
is unlinked. However this assumption is not correct, as zfs_zget can be
called by NFS through zpl_fh_to_dentry as pointed out by Christian in
https://github.com/openzfs/zfs/pull/12767, which could result in a
use-after-free bug.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #12767 
Closes #14364
This commit is contained in:
Chunwei Chen
2023-01-19 16:59:05 -08:00
committed by GitHub
parent a379083d9f
commit c6dab6dd39
5 changed files with 20 additions and 5 deletions
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module/os/linux/zfs/zfs_dir.c
+8 -1
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@@ -649,6 +649,8 @@ zfs_rmnode(znode_t *zp)
objset_t *os = zfsvfs->z_os;
znode_t *xzp = NULL;
dmu_tx_t *tx;
znode_hold_t *zh;
uint64_t z_id = zp->z_id;
uint64_t acl_obj;
uint64_t xattr_obj;
uint64_t links;
@@ -666,8 +668,9 @@ zfs_rmnode(znode_t *zp)
* Not enough space to delete some xattrs.
* Leave it in the unlinked set.
*/
zh = zfs_znode_hold_enter(zfsvfs, z_id);
zfs_znode_dmu_fini(zp);
zfs_znode_hold_exit(zfsvfs, zh);
return;
}
}
@@ -686,7 +689,9 @@ zfs_rmnode(znode_t *zp)
* Not enough space or we were interrupted by unmount.
* Leave the file in the unlinked set.
*/
zh = zfs_znode_hold_enter(zfsvfs, z_id);
zfs_znode_dmu_fini(zp);
zfs_znode_hold_exit(zfsvfs, zh);
return;
}
}
@@ -726,7 +731,9 @@ zfs_rmnode(znode_t *zp)
* which point we'll call zfs_unlinked_drain() to process it).
*/
dmu_tx_abort(tx);
zh = zfs_znode_hold_enter(zfsvfs, z_id);
zfs_znode_dmu_fini(zp);
zfs_znode_hold_exit(zfsvfs, zh);
goto out;
}