diff --git a/vm/memblock.c b/vm/memblock.c
index cce6dbe..775fa19 100644
--- a/vm/memblock.c
+++ b/vm/memblock.c
@@ -311,7 +311,10 @@ int memblock_free_phys(phys_addr_t addr, size_t size)
 	return 0;
 }
 
-void __next_memory_region(struct memblock_iter *it, struct memblock_type *type_a, struct memblock_type *type_b, uintptr_t start, uintptr_t end)
+void __next_memory_region(
+		struct memblock_iter *it,
+		struct memblock_type *type_a, struct memblock_type *type_b,
+		uintptr_t start, uintptr_t end)
 {
 	unsigned int idx_a = IDX_A(it->__idx);
 	unsigned int idx_b = IDX_B(it->__idx);
@@ -323,10 +326,14 @@ void __next_memory_region(struct memblock_iter *it, struct memblock_type *type_a
 		uintptr_t m_end = m->limit;
 
 		if (!type_b) {
-			it->it_base = m->base;
-			it->it_limit = m->limit;
+			it->it_base = MAX(m->base, start);
+			it->it_limit = MIN(m->limit, end);
 			it->it_status = m->status;
 
+			if (it->it_base >= it->it_limit) {
+				continue;
+			}
+
 			it->__idx = ITER(idx_a + 1, idx_b);
 			return;
 		}