diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 7786ab306225..b07e3ffc5ac5 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -291,6 +291,10 @@ pti_clone_pmds(unsigned long start, unsigned long end, pmdval_t clear)
 		p4d_t *p4d;
 		pud_t *pud;
 
+		/* Overflow check */
+		if (addr < start)
+			break;
+
 		pgd = pgd_offset_k(addr);
 		if (WARN_ON(pgd_none(*pgd)))
 			return;