diff --git a/components/nstackx/fillp/src/fillp_lib/include/fillp/fillp.h b/components/nstackx/fillp/src/fillp_lib/include/fillp/fillp.h
index dc88936dc..5e0bc0b31 100644
--- a/components/nstackx/fillp/src/fillp_lib/include/fillp/fillp.h
+++ b/components/nstackx/fillp/src/fillp_lib/include/fillp/fillp.h
@@ -388,7 +388,7 @@ typedef enum InnerfillpClientfourhandshakestateEnum {
 
 static __inline FILLP_INT FillpNumIsbigger(FILLP_UINT32 value1, FILLP_UINT32 value2)
 {
-    return ((FILLP_INT32)(value1 - value2)) > 0;
+    return value1 > value2;
 }
 
 void FillpSendConnConfirmAck(struct FillpPcb *pcb);
diff --git a/components/nstackx/fillp/src/fillp_lib/src/hmac.c b/components/nstackx/fillp/src/fillp_lib/src/hmac.c
index f8f3fd982..ac55bc1d7 100644
--- a/components/nstackx/fillp/src/fillp_lib/src/hmac.c
+++ b/components/nstackx/fillp/src/fillp_lib/src/hmac.c
@@ -43,17 +43,18 @@ Return         : NA
 ******************************************************************************/
 static void FillpCleanSedata(void *ptr, size_t len, struct SpungeInstance *pcbInst)
 {
-    FILLP_UINT8 *pptr = ptr;
-    size_t loop = len;
-    size_t ctr = pcbInst->cleanseDataCtr;
-
     if (ptr == FILLP_NULL_PTR) {
         return;
     }
 
-    while (loop--) {
+    FILLP_UINT8 *pptr = ptr;
+    size_t loop = len;
+    size_t ctr = pcbInst->cleanseDataCtr;
+
+    while (loop > 0) {
         *(pptr++) = (FILLP_UINT8)ctr;
         ctr += (CSE_DATA_ONE_PAR + ((size_t)(uintptr_t)pptr & 0xF));
+        loop--;
     }
 
     pptr = FILLP_MEMCHR(ptr, (FILLP_UINT8)ctr, len);
diff --git a/components/nstackx/fillp/src/fillp_lib/src/spunge_stack.c b/components/nstackx/fillp/src/fillp_lib/src/spunge_stack.c
index 28b17709d..4b9d169ab 100644
--- a/components/nstackx/fillp/src/fillp_lib/src/spunge_stack.c
+++ b/components/nstackx/fillp/src/fillp_lib/src/spunge_stack.c
@@ -354,7 +354,7 @@ FILLP_BOOL SpungeConnCheckUnsendBoxEmpty(struct FtNetconn *conn)
     con = unsendBox->ring.cons.head + 1;
     prod = unsendBox->ring.prod.tail;
 
-    while (((FILLP_LLONG)(prod - con)) >= 0) {
+    while (prod >= con) {
         data = unsendBox->ring.ringCache[con % unsendBox->ring.size];
         con++;