Merge pull request #2498 from taosdata/hotfix/invalidWrite

check the application message length before passing it to server

src/rpc/src/rpcMain.c

@@ -1034,6 +1034,7 @@ static void rpcProcessIncomingMsg(SRpcConn *pConn, SRpcHead *pHead) {
   rpcMsg.ahandle = pConn->ahandle;
    
   if ( rpcIsReq(pHead->msgType) ) {
+    if (rpcMsg.contLen > 0) {
       rpcMsg.handle = pConn;
       rpcAddRef(pRpc);  // add the refCount for requests
 
@@ -1043,6 +1044,10 @@ static void rpcProcessIncomingMsg(SRpcConn *pConn, SRpcHead *pHead) {
  
       // notify the server app
       (*(pRpc->cfp))(&rpcMsg, NULL);
+    } else {
+      tDebug("%s, message body is empty, ignore", pConn->info);
+      rpcFreeCont(rpcMsg.pCont);
+    }
   } else {
     // it's a response
     SRpcReqContext *pContext = pConn->pContext;