diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 8e50c943b9..bd91c467b6 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -2402,10 +2402,18 @@ void* tDecodeDataBlock(const void* buf, SSDataBlock* pBlock) {
     } else {
       buf = taosDecodeBinary(buf, (void**)&data.nullbitmap, BitmapLen(pBlock->info.rows));
     }
+    if(buf == NULL) {
+      uError("failed to decode null bitmap/offset, type:%d", data.info.type);
+      return NULL;
+    }
 
     int32_t len = 0;
     buf = taosDecodeFixedI32(buf, &len);
     buf = taosDecodeBinary(buf, (void**)&data.pData, len);
+    if (buf == NULL) {
+      uError("failed to decode data, type:%d", data.info.type);
+      return NULL;
+    }
     if (IS_VAR_DATA_TYPE(data.info.type)) {
       data.varmeta.length = len;
       data.varmeta.allocLen = len;
@@ -2418,6 +2426,15 @@ void* tDecodeDataBlock(const void* buf, SSDataBlock* pBlock) {
   }
 
   return (void*)buf;
+_error:
+  for (int32_t i = 0; i < sz; ++i) {
+    SColumnInfoData* pColInfoData = (SColumnInfoData*)taosArrayGet(pBlock->pDataBlock, i);
+    if (pColInfoData == NULL) {
+      break;
+    }
+    colDataDestroy(pColInfoData);
+  }
+  return NULL;
 }
 
 static char* formatTimestamp(char* buf, int64_t val, int precision) {
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 84ab103456..2fa0cef5e8 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -5996,6 +5996,10 @@ int32_t modeFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResInfo) {
   pInfo->colBytes = pCtx->resDataInfo.bytes;
   if (pInfo->pHash != NULL) {
     taosHashClear(pInfo->pHash);
+    pInfo->pHash = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_NO_LOCK);
+    if (NULL == pInfo->pHash) {
+      return terrno;
+    }
   } else {
     pInfo->pHash = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_NO_LOCK);
     if (NULL == pInfo->pHash) {
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index adcce879eb..b17af44260 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -524,7 +524,12 @@ void udfdDeinitScriptPlugins() {
 void udfdProcessRequest(uv_work_t *req) {
   SUvUdfWork *uvUdf = (SUvUdfWork *)(req->data);
   SUdfRequest request = {0};
-  if(decodeUdfRequest(uvUdf->input.base, &request) == NULL) return;
+  if(decodeUdfRequest(uvUdf->input.base, &request) == NULL)
+  {
+    taosMemoryFree(uvUdf->input.base);
+    fnError("udf request decode failed");
+    return;
+  }
 
   switch (request.type) {
     case UDF_TASK_SETUP: {