Index: sys/vm/vm_map.c
===================================================================
--- sys/vm/vm_map.c
+++ sys/vm/vm_map.c
@@ -3613,10 +3613,12 @@
 	    ("bi-dir stack"));
 
 	sgp = (vm_size_t)stack_guard_page * PAGE_SIZE;
+	if (sgp >= max_ssize)
+		return (KERN_INVALID_ARGUMENT);
+
 	if (addrbos < vm_map_min(map) ||
 	    addrbos > vm_map_max(map) ||
-	    addrbos + max_ssize < addrbos ||
-	    sgp >= max_ssize)
+	    addrbos + max_ssize < addrbos)
 		return (KERN_NO_SPACE);
 
 	init_ssize = growsize;