Merge tag 'nfsd-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd fix from Chuck Lever:

 - Fix a use-after-free when unlocking a filesystem

* tag 'nfsd-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  NFSD: Prevent post-shutdown use-after-free in NFSD_CMD_UNLOCK_FILESYSTEM

Author: torvalds

fs/nfsd/nfsctl.c

@@ -2340,14 +2340,15 @@ int nfsd_nl_unlock_filesystem_doit(struct sk_buff *skb,
 	if (error)
 		return error;
 
-	nfsd4_cancel_copy_by_sb(net, path.dentry->d_sb);
 	error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 
 	mutex_lock(&nfsd_mutex);
-	if (nn->nfsd_serv)
+	if (nn->nfsd_serv) {
+		nfsd4_cancel_copy_by_sb(net, path.dentry->d_sb);
 		nfsd4_revoke_states(nn, path.dentry->d_sb);
-	else
+	} else {
 		error = -EINVAL;
+	}
 	mutex_unlock(&nfsd_mutex);
 
 	path_put(&path);