schemaless fix measurement len = 0 causing crash (#8247)

* schemaless fix error code

* schemaless fixed measurement len = 0 crash

src/client/src/tscParseLineProtocol.c

@@ -1891,6 +1891,9 @@ static int32_t parseSmlKey(TAOS_SML_KV *pKV, const char **index, SHashObj *pHash
     cur++;
     len++;
   }
+  if (len == 0) {
+    return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+  }
   key[len] = '\0';
 
   if (checkDuplicateKey(key, pHash, info)) {
@@ -1905,7 +1908,7 @@ static int32_t parseSmlKey(TAOS_SML_KV *pKV, const char **index, SHashObj *pHash
 }
 
 
-static bool parseSmlValue(TAOS_SML_KV *pKV, const char **index,
+static int32_t parseSmlValue(TAOS_SML_KV *pKV, const char **index,
                           bool *is_last_kv, SSmlLinesInfo* info, bool isTag) {
   const char *start, *cur;
   char *value = NULL;
@@ -1931,6 +1934,11 @@ static bool parseSmlValue(TAOS_SML_KV *pKV, const char **index,
     cur++;
     len++;
   }
+  if (len == 0) {
+    free(pKV->key);
+    pKV->key = NULL;
+    return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+  }
 
   value = calloc(len + 1, 1);
   memcpy(value, start, len);
@@ -1996,6 +2004,11 @@ static int32_t parseSmlMeasurement(TAOS_SML_DATA_POINT *pSml, const char **index
     cur++;
     len++;
   }
+  if (len == 0) {
+    free(pSml->stableName);
+    pSml->stableName = NULL;
+    return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
+  }
   pSml->stableName[len] = '\0';
   *index = cur + 1;
   tscDebug("SML:0x%"PRIx64" Stable name in measurement:%s|len:%d", info->id, pSml->stableName, len);