diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index 8834c76f91c9..944e6a912fc6 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -305,6 +305,9 @@ static inline unsigned long fix_addr(unsigned long addr)
 
 static unsigned long __cpa_addr(struct cpa_data *cpa, unsigned long idx)
 {
+	if (WARN_ON_ONCE(!cpa->pages || !cpa->pages[idx]))
+		return 0;
+
 	if (cpa->flags & CPA_PAGES_ARRAY) {
 		struct page *page = cpa->pages[idx];