diff --git a/libpurgeablemem/c/src/purgeable_mem_c.c b/libpurgeablemem/c/src/purgeable_mem_c.c
index 2c150ca05f8453b4bea873523e16b5c915592908..e1a08fee34d2c2e1301cc682ff7b0f593e6d0253 100644
--- a/libpurgeablemem/c/src/purgeable_mem_c.c
+++ b/libpurgeablemem/c/src/purgeable_mem_c.c
@@ -72,8 +72,9 @@ static struct PurgMem *PurgMemCreate_(size_t len, struct PurgMemBuilder *builder
         return NULL;
     }
     size_t size = RoundUp(len, PAGE_SIZE);
-    int type = MAP_ANONYMOUS;
-    type |= (UxpteIsEnabled() ? MAP_PURGEABLE : MAP_PRIVATE);
+    unsigned int utype = MAP_ANONYMOUS;
+    utype |= (UxpteIsEnabled() ? MAP_PURGEABLE : MAP_PRIVATE);
+    int type = (int) utype;
     pugObj->dataPtr = mmap(NULL, size, PROT_READ | PROT_WRITE, type, -1, 0);
     if (pugObj->dataPtr == MAP_FAILED) {
         PM_HILOG_ERROR_C(LOG_CORE, "%{public}s: mmap dataPtr fail", __func__);
diff --git a/libpurgeablemem/common/src/ux_page_table_c.c b/libpurgeablemem/common/src/ux_page_table_c.c
index 8fe95defac574dfb0d28df8b69843bdeebf3bc34..7dd5e4cbcdd173010dfce01f0007a45b21c0ad25 100644
--- a/libpurgeablemem/common/src/ux_page_table_c.c
+++ b/libpurgeablemem/common/src/ux_page_table_c.c
@@ -259,8 +259,13 @@ static inline bool UxpteCAS_(uxpte_t *uxpte, uxpte_t old, uxpte_t newVal)
 
 static void UxpteAdd(uxpte_t *pte, size_t incNum)
 {
-    uxpte_t old;
+    uxpte_t old = 0;
+    uxpte_t newVal = 0;
     do {
+        if (old + incNum < old || old + incNum < incNum) {
+            break;
+        }
+        newVal = old + incNum;
         old = UxpteLoad(pte);
         if (ULONG_MAX - old < incNum) {
             return;
@@ -269,7 +274,7 @@ static void UxpteAdd(uxpte_t *pte, size_t incNum)
             sched_yield();
             continue;
         }
-    } while (!UxpteCAS_(pte, old, old + incNum));
+    } while (!UxpteCAS_(pte, old, newVal));
 }
 
 static void UxpteSub(uxpte_t *pte, size_t decNum)