diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index f843c8559cae4e2b1595de93cb73c11ec5c77c14..4ae1a1083afddcd00beb42e753090088a91f1c0f 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -128,10 +128,10 @@ int transDumpFromBuffer(SConnBuffer* connBuf, char** buf) {
   static const int HEADSIZE = sizeof(STransMsgHead);
 
   SConnBuffer* p = connBuf;
-  if (p->left != 0) {
+  if (p->left != 0 || p->total <= 0) {
     return -1;
   }
-  int total = connBuf->total;
+  int total = p->total;
   if (total >= HEADSIZE && !p->invalid) {
     *buf = taosMemoryCalloc(1, total);
     memcpy(*buf, p->buf, total);