diff --git a/src/libos/src/vm/free_space_manager.rs b/src/libos/src/vm/free_space_manager.rs
index 4a39fb86..adaf764e 100644
--- a/src/libos/src/vm/free_space_manager.rs
+++ b/src/libos/src/vm/free_space_manager.rs
@@ -48,7 +48,7 @@ impl VMFreeSpaceManager {
                 if free_range.size() < size {
                     continue;
                 }
-                unsafe { VMRange::from_unchecked(free_range.start(), free_range.end()) }
+                free_range.clone()
             };
 
             match addr {
diff --git a/src/libos/src/vm/user_space_vm.rs b/src/libos/src/vm/user_space_vm.rs
index 00ebd58f..094de65f 100644
--- a/src/libos/src/vm/user_space_vm.rs
+++ b/src/libos/src/vm/user_space_vm.rs
@@ -29,7 +29,7 @@ impl UserSpaceVMManager {
                 "allocated rsrv addr is 0x{:x}, len is 0x{:x}",
                 addr, rsrv_mem_size
             );
-            VMRange::from_unchecked(addr, addr + rsrv_mem_size)
+            VMRange::new(addr, addr + rsrv_mem_size)?
         };
 
         let vm_manager = VMManager::init(vm_range)?;
diff --git a/src/libos/src/vm/vm_manager.rs b/src/libos/src/vm/vm_manager.rs
index fb412fc8..5ac5122b 100644
--- a/src/libos/src/vm/vm_manager.rs
+++ b/src/libos/src/vm/vm_manager.rs
@@ -74,14 +74,14 @@ impl VMManager {
         match addr {
             VMMapAddr::Any => {}
             VMMapAddr::Hint(addr) => {
-                let target_range = unsafe { VMRange::from_unchecked(addr, addr + size) };
+                let target_range = VMRange::new(addr, addr + size)?;
                 let ret = self.mmap_with_addr(target_range, options);
                 if ret.is_ok() {
                     return ret;
                 }
             }
             VMMapAddr::Need(addr) | VMMapAddr::Force(addr) => {
-                let target_range = unsafe { VMRange::from_unchecked(addr, addr + size) };
+                let target_range = VMRange::new(addr, addr + size)?;
                 return self.mmap_with_addr(target_range, options);
             }
         }