diff --git a/src/client/src/tscParseLineProtocol.c b/src/client/src/tscParseLineProtocol.c
index e6e0cf6b4d..61d9e5a785 100644
--- a/src/client/src/tscParseLineProtocol.c
+++ b/src/client/src/tscParseLineProtocol.c
@@ -1391,6 +1391,105 @@ static bool isTimeStamp(char *pVal, uint16_t len, SMLTimeStampType *tsType) {
   return false;
 }
 
+static bool convertStrToNumber(TAOS_SML_KV *pVal, char*str) {
+  errno = 0;
+  uint8_t type = pVal->type;
+  int16_t length = pVal->length;
+  int64_t val_s;
+  uint64_t val_u;
+  double val_d;
+
+  if (IS_FLOAT_TYPE(type)) {
+    val_d = strtod(str, NULL);
+  } else {
+    if (IS_SIGNED_NUMERIC_TYPE(type)) {
+      val_s = strtoll(str, NULL, 10);
+    } else {
+      val_u = strtoull(str, NULL, 10);
+    }
+  }
+
+  if (errno == ERANGE) {
+    tscError("Converted number out of range");
+    return false;
+  }
+
+  switch (type) {
+    case TSDB_DATA_TYPE_TINYINT:
+      if (!IS_VALID_TINYINT(val_s)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(int8_t *)(pVal->value) = (int8_t)val_s;
+      break;
+    case TSDB_DATA_TYPE_UTINYINT:
+      if (!IS_VALID_UTINYINT(val_u)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(uint8_t *)(pVal->value) = (uint8_t)val_u;
+      break;
+    case TSDB_DATA_TYPE_SMALLINT:
+      if (!IS_VALID_SMALLINT(val_s)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(int16_t *)(pVal->value) = (int16_t)val_s;
+      break;
+    case TSDB_DATA_TYPE_USMALLINT:
+      if (!IS_VALID_USMALLINT(val_u)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(uint16_t *)(pVal->value) = (uint16_t)val_u;
+      break;
+    case TSDB_DATA_TYPE_INT:
+      if (!IS_VALID_INT(val_s)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(int32_t *)(pVal->value) = (int32_t)val_s;
+      break;
+    case TSDB_DATA_TYPE_UINT:
+      if (!IS_VALID_UINT(val_u)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(uint32_t *)(pVal->value) = (uint32_t)val_u;
+      break;
+    case TSDB_DATA_TYPE_BIGINT:
+      if (!IS_VALID_BIGINT(val_s)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(int64_t *)(pVal->value) = (int64_t)val_s;
+      break;
+    case TSDB_DATA_TYPE_UBIGINT:
+      if (!IS_VALID_UBIGINT(val_u)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(uint64_t *)(pVal->value) = (uint64_t)val_u;
+      break;
+    case TSDB_DATA_TYPE_FLOAT:
+      if (!IS_VALID_FLOAT(val_d)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(float *)(pVal->value) = (float)val_d;
+      break;
+    case TSDB_DATA_TYPE_DOUBLE:
+      if (!IS_VALID_DOUBLE(val_d)) {
+        return false;
+      }
+      pVal->value = calloc(length, 1);
+      *(double *)(pVal->value) = (double)val_d;
+      break;
+    default:
+      return false;
+  }
+  return true;
+}
 //len does not include '\0' from value.
 static bool convertSmlValueType(TAOS_SML_KV *pVal, char *value,
                                 uint16_t len) {
@@ -1403,97 +1502,72 @@ static bool convertSmlValueType(TAOS_SML_KV *pVal, char *value,
     pVal->type = TSDB_DATA_TYPE_TINYINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 2] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    int8_t val = (int8_t)strtoll(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isTinyUint(value, len)) {
     pVal->type = TSDB_DATA_TYPE_UTINYINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 2] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    uint8_t val = (uint8_t)strtoul(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isSmallInt(value, len)) {
     pVal->type = TSDB_DATA_TYPE_SMALLINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    int16_t val = (int16_t)strtoll(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isSmallUint(value, len)) {
     pVal->type = TSDB_DATA_TYPE_USMALLINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    uint16_t val = (uint16_t)strtoul(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
-    //memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isInt(value, len)) {
     pVal->type = TSDB_DATA_TYPE_INT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    int32_t val = (int32_t)strtoll(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isUint(value, len)) {
     pVal->type = TSDB_DATA_TYPE_UINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    uint32_t val = (uint32_t)strtoul(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isBigInt(value, len)) {
     pVal->type = TSDB_DATA_TYPE_BIGINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    int64_t val = (int64_t)strtoll(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isBigUint(value, len)) {
     pVal->type = TSDB_DATA_TYPE_UBIGINT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidInteger(value)) {
+    if (!isValidInteger(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    uint64_t val = (uint64_t)strtoul(value, NULL, 10);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   //floating number
@@ -1501,24 +1575,18 @@ static bool convertSmlValueType(TAOS_SML_KV *pVal, char *value,
     pVal->type = TSDB_DATA_TYPE_FLOAT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidFloat(value)) {
+    if (!isValidFloat(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    float val = (float)strtold(value, NULL);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   if (isDouble(value, len)) {
     pVal->type = TSDB_DATA_TYPE_DOUBLE;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
     value[len - 3] = '\0';
-    if (!isValidFloat(value)) {
+    if (!isValidFloat(value) || !convertStrToNumber(pVal, value)) {
       return false;
     }
-    pVal->value = calloc(pVal->length, 1);
-    double val = (double)strtold(value, NULL);
-    memcpy(pVal->value, &val, pVal->length);
     return true;
   }
   //binary
@@ -1552,9 +1620,9 @@ static bool convertSmlValueType(TAOS_SML_KV *pVal, char *value,
   if (isValidInteger(value) || isValidFloat(value)) {
     pVal->type = TSDB_DATA_TYPE_FLOAT;
     pVal->length = (int16_t)tDataTypes[pVal->type].bytes;
-    pVal->value = calloc(pVal->length, 1);
-    float val = (float)strtold(value, NULL);
-    memcpy(pVal->value, &val, pVal->length);
+    if (!convertStrToNumber(pVal, value)) {
+      return false;
+    }
     return true;
   }
   return false;
@@ -1728,6 +1796,7 @@ static bool parseSmlValue(TAOS_SML_KV *pKV, const char **index,
   if (!convertSmlValueType(pKV, value, len)) {
     //free previous alocated key field
     free(pKV->key);
+    pKV->key = NULL;
     free(value);
     return TSDB_CODE_TSC_LINE_SYNTAX_ERROR;
   }
diff --git a/src/inc/ttype.h b/src/inc/ttype.h
index 6e436bd23d..fcd2651c70 100644
--- a/src/inc/ttype.h
+++ b/src/inc/ttype.h
@@ -138,6 +138,8 @@ typedef struct {
 #define IS_VALID_USMALLINT(_t)  ((_t) >= 0 && (_t) < UINT16_MAX)
 #define IS_VALID_UINT(_t)       ((_t) >= 0 && (_t) < UINT32_MAX)
 #define IS_VALID_UBIGINT(_t)    ((_t) >= 0 && (_t) < UINT64_MAX)
+#define IS_VALID_FLOAT(_t)      ((_t) >= -FLT_MAX && (_t) <= FLT_MAX)
+#define IS_VALID_DOUBLE(_t)     ((_t) >= -DBL_MAX && (_t) <= DBL_MAX)
 
 static FORCE_INLINE bool isNull(const char *val, int32_t type) {
   switch (type) {
diff --git a/src/util/src/tstrbuild.c b/src/util/src/tstrbuild.c
index 61a6d67952..eec21d1835 100644
--- a/src/util/src/tstrbuild.c
+++ b/src/util/src/tstrbuild.c
@@ -69,12 +69,12 @@ void taosStringBuilderAppendNull(SStringBuilder* sb) { taosStringBuilderAppendSt
 
 void taosStringBuilderAppendInteger(SStringBuilder* sb, int64_t v) {
   char   buf[64];
-  size_t len = sprintf(buf, "%" PRId64, v);
-  taosStringBuilderAppendStringLen(sb, buf, len);
+  size_t len = snprintf(buf, sizeof(buf), "%" PRId64, v);
+  taosStringBuilderAppendStringLen(sb, buf, MIN(len, sizeof(buf)));
 }
 
 void taosStringBuilderAppendDouble(SStringBuilder* sb, double v) {
-  char   buf[64];
-  size_t len = sprintf(buf, "%.9lf", v);
-  taosStringBuilderAppendStringLen(sb, buf, len);
+  char   buf[512];
+  size_t len = snprintf(buf, sizeof(buf), "%.9lf", v);
+  taosStringBuilderAppendStringLen(sb, buf, MIN(len, sizeof(buf)));
 }