diff --git a/sys/fs/nfsserver/nfs_nfsdkrpc.c b/sys/fs/nfsserver/nfs_nfsdkrpc.c
index 337951b..c448cae 100644
--- a/sys/fs/nfsserver/nfs_nfsdkrpc.c
+++ b/sys/fs/nfsserver/nfs_nfsdkrpc.c
@@ -413,9 +413,15 @@ int
 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
 {
 	char principal[MAXHOSTNAMELEN + 5];
-	int error = 0;
+	int error;
 	bool_t ret2, ret3, ret4;
 
+	if (args->minthreads < 1 || args->maxthreads < 1 ||
+	    (args->minthreads > args->maxthreads)) {
+		error = EINVAL;
+		goto out;
+	}
+
 	error = copyinstr(args->principal, principal, sizeof (principal),
 	    NULL);
 	if (error)
diff --git a/sys/nfsserver/nfs_srvkrpc.c b/sys/nfsserver/nfs_srvkrpc.c
index 2581092..ecc80be 100644
--- a/sys/nfsserver/nfs_srvkrpc.c
+++ b/sys/nfsserver/nfs_srvkrpc.c
@@ -423,6 +423,9 @@ nfssvc_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
 	int error;
 
 	if (args) {
+		if (args->minthreads < 1 || args->maxthreads < 1 ||
+		    (args->minthreads > args->maxthreads))
+			return (EINVAL);
 		error = copyinstr(args->principal, principal,
 		    sizeof(principal), NULL);
 		if (error)