Merge pull request #9029 from devinsong/develop

PR for FQDN length check..

src/util/src/tnettest.c

@@ -568,6 +568,12 @@ static void taosNetCheckSpeed(char *host, int32_t port, int32_t pkgLen,
   int32_t compressTmp = tsCompressMsgSize;
   int32_t maxUdpSize  = tsRpcMaxUdpSize;
   int32_t forceTcp  = tsRpcForceTcp;
+  
+  //Precheck for FQDN lgenth
+  if (strlen(host) >= TSDB_FQDN_LEN) {
+    uError("FQDN length is too long");
+    return;
+  }
 
   if (0 == strcmp("tcp", pkgType)){
     tsRpcForceTcp = 1;