diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 71fba17c9d7c4c712c62d98db9a9bfe6cdc5588b..79217868dd134913d49f39f87717b1d262ffb2c0 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -297,6 +297,10 @@ 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;