diff --git a/src/core/stellar_config.cpp b/src/core/stellar_config.cpp
index f30c1a8..ebdac97 100644
--- a/src/core/stellar_config.cpp
+++ b/src/core/stellar_config.cpp
@@ -46,7 +46,11 @@ static int parse_snowflake_section(toml_table_t *root, struct snowflake_options
 // retuun -1: failed
 static int parse_packet_io_section(toml_table_t *root, struct packet_io_options *opts)
 {
-    char *temp;
+    int ret = -1;
+    char *ptr_mode = NULL;
+    char *ptr_dumpfile_path = NULL;
+    char *ptr_app_symbol = NULL;
+    char *ptr_dev_symbol = NULL;
     const char *ptr;
     toml_table_t *table;
     toml_array_t *mask_array;
@@ -55,76 +59,72 @@ static int parse_packet_io_section(toml_table_t *root, struct packet_io_options
     if (table == NULL)
     {
         CONFIG_LOG_ERROR("config file missing packet_io section");
-        return -1;
+        goto error_out;
     }
 
     ptr = toml_raw_in(table, "mode");
-    temp = NULL;
-    if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+    if (ptr == NULL || toml_rtos(ptr, &ptr_mode) != 0)
     {
         CONFIG_LOG_ERROR("config file missing packet_io->mode");
-        return -1;
+        goto error_out;
     }
-    if (strcmp(temp, "dumpfile") == 0)
+    if (strcmp(ptr_mode, "dumpfile") == 0)
     {
         opts->mode = PACKET_IO_DUMPFILE;
     }
-    else if (strcmp(temp, "dumpfilelist") == 0)
+    else if (strcmp(ptr_mode, "dumpfilelist") == 0)
     {
         opts->mode = PACKET_IO_DUMPFILELIST;
     }
-    else if (strcmp(temp, "marsio") == 0)
+    else if (strcmp(ptr_mode, "marsio") == 0)
     {
         opts->mode = PACKET_IO_MARSIO;
     }
     else
     {
         CONFIG_LOG_ERROR("config file invalid packet_io->mode %s, only support dumpfile and marsio", ptr);
-        return -1;
+        goto error_out;
     }
 
     if (opts->mode == PACKET_IO_DUMPFILE || opts->mode == PACKET_IO_DUMPFILELIST)
     {
         ptr = toml_raw_in(table, "dumpfile_path");
-        temp = NULL;
-        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+        if (ptr == NULL || toml_rtos(ptr, &ptr_dumpfile_path) != 0)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->dumpfile_path");
-            return -1;
+            goto error_out;
         }
-        strcpy(opts->dumpfile_path, temp);
+        strcpy(opts->dumpfile_path, ptr_dumpfile_path);
     }
     else
     {
         ptr = toml_raw_in(table, "app_symbol");
-        temp = NULL;
-        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+        if (ptr == NULL || toml_rtos(ptr, &ptr_app_symbol) != 0)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->app_symbol");
-            return -1;
+            goto error_out;
         }
-        strcpy(opts->app_symbol, temp);
+        strcpy(opts->app_symbol, ptr_app_symbol);
 
         ptr = toml_raw_in(table, "dev_symbol");
-        temp = NULL;
-        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+        if (ptr == NULL || toml_rtos(ptr, &ptr_dev_symbol) != 0)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->dev_symbol");
-            return -1;
+            goto error_out;
         }
-        strcpy(opts->dev_symbol, temp);
+        strcpy(opts->dev_symbol, ptr_dev_symbol);
     }
 
     ptr = toml_raw_in(table, "nr_threads");
     if (ptr == NULL)
     {
         CONFIG_LOG_ERROR("config file missing packet_io->nr_threads");
-        return -1;
+        goto error_out;
     }
     if (atoi(ptr) <= 0 || atoi(ptr) > MAX_THREAD_NUM)
     {
         CONFIG_LOG_ERROR("config file invalid packet_io->nr_threads %d, range [1, %d]", atoi(ptr), MAX_THREAD_NUM);
-        return -1;
+        goto error_out;
     }
     opts->nr_threads = atoi(ptr);
 
@@ -132,7 +132,7 @@ static int parse_packet_io_section(toml_table_t *root, struct packet_io_options
     if (mask_array == NULL)
     {
         CONFIG_LOG_ERROR("config file missing packet_io->cpu_mask");
-        return -1;
+        goto error_out;
     }
     for (uint16_t i = 0; i < opts->nr_threads; i++)
     {
@@ -140,12 +140,32 @@ static int parse_packet_io_section(toml_table_t *root, struct packet_io_options
         if (ptr == NULL)
         {
             CONFIG_LOG_ERROR("config file missing packet_io->cpu_mask[%d]", i);
-            return -1;
+            goto error_out;
         }
         opts->cpu_mask[i] = atoi(ptr);
     }
 
-    return 0;
+    ret = 0;
+
+error_out:
+    if (ptr_mode)
+    {
+        free(ptr_mode);
+    }
+    if (ptr_dumpfile_path)
+    {
+        free(ptr_dumpfile_path);
+    }
+    if (ptr_app_symbol)
+    {
+        free(ptr_app_symbol);
+    }
+    if (ptr_dev_symbol)
+    {
+        free(ptr_dev_symbol);
+    }
+
+    return ret;
 }
 
 // return  0: success
diff --git a/src/core/stellar_core.cpp b/src/core/stellar_core.cpp
index 7f83d7d..3ce75f6 100644
--- a/src/core/stellar_core.cpp
+++ b/src/core/stellar_core.cpp
@@ -627,6 +627,9 @@ void stellar_free(struct stellar *st)
         stellar_stat_free(runtime->stat);
         STELLAR_LOG_FATAL("stellar exit\n");
         log_free();
+
+        free(st);
+        st = NULL;
     }
 }
 
diff --git a/src/log/log.cpp b/src/log/log.cpp
index 5743a30..25d2797 100644
--- a/src/log/log.cpp
+++ b/src/log/log.cpp
@@ -4,6 +4,7 @@
 #include <unistd.h>
 #include <stdarg.h>
 #include <limits.h>
+#include <stdlib.h>
 #include <pthread.h>
 
 #include "log.h"
@@ -93,10 +94,12 @@ static int parse_config(struct log_config *config, const char *cfg_file)
     int ret = -1;
     FILE *fp = NULL;
     char errbuf[200];
-    char *temp;
+    char *ptr_output = NULL;
+    char *ptr_file = NULL;
+    char *ptr_level = NULL;
     const char *ptr;
-    toml_table_t *log_section = NULL;
-    toml_table_t *conf_table = NULL;
+    toml_table_t *section = NULL;
+    toml_table_t *table = NULL;
 
     fp = fopen(cfg_file, "r");
     if (fp == NULL)
@@ -105,37 +108,36 @@ static int parse_config(struct log_config *config, const char *cfg_file)
         goto error_out;
     }
 
-    conf_table = toml_parse_file(fp, errbuf, sizeof(errbuf));
-    if (conf_table == NULL)
+    table = toml_parse_file(fp, errbuf, sizeof(errbuf));
+    if (table == NULL)
     {
         fprintf(stderr, "parse config file %s failed, %s\n", cfg_file, errbuf);
         goto error_out;
     }
 
-    log_section = toml_table_in(conf_table, "log");
-    if (log_section == NULL)
+    section = toml_table_in(table, "log");
+    if (section == NULL)
     {
         fprintf(stderr, "config file %s missing log section\n", cfg_file);
         goto error_out;
     }
 
     // output
-    ptr = toml_raw_in(log_section, "output");
-    temp = NULL;
-    if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+    ptr = toml_raw_in(section, "output");
+    if (ptr == NULL || toml_rtos(ptr, &ptr_output) != 0)
     {
         fprintf(stderr, "config file %s missing log.output\n", cfg_file);
         goto error_out;
     }
-    if (strcasecmp(temp, "stderr") == 0)
+    if (strcasecmp(ptr_output, "stderr") == 0)
     {
         config->output = LOG_OUTPUT_STDERR;
     }
-    else if (strcasecmp(temp, "file") == 0)
+    else if (strcasecmp(ptr_output, "file") == 0)
     {
         config->output = LOG_OUTPUT_FILE;
     }
-    else if (strcasecmp(temp, "both") == 0)
+    else if (strcasecmp(ptr_output, "both") == 0)
     {
         config->output = LOG_OUTPUT_BOTH;
     }
@@ -147,25 +149,23 @@ static int parse_config(struct log_config *config, const char *cfg_file)
 
     if (config->output == LOG_OUTPUT_FILE || config->output == LOG_OUTPUT_BOTH)
     {
-        ptr = toml_raw_in(log_section, "file");
-        temp = NULL;
-        if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+        ptr = toml_raw_in(section, "file");
+        if (ptr == NULL || toml_rtos(ptr, &ptr_file) != 0)
         {
             fprintf(stderr, "config file %s missing log.file\n", cfg_file);
             goto error_out;
         }
-        strcpy(config->log_file, temp);
+        strcpy(config->log_file, ptr_file);
     }
 
     // level
-    ptr = toml_raw_in(log_section, "level");
-    temp = NULL;
-    if (ptr == NULL || toml_rtos(ptr, &temp) != 0)
+    ptr = toml_raw_in(section, "level");
+    if (ptr == NULL || toml_rtos(ptr, &ptr_level) != 0)
     {
         fprintf(stderr, "config file %s missing log.level\n", cfg_file);
         goto error_out;
     }
-    config->level = check_level(temp);
+    config->level = check_level(ptr_level);
     if (config->level == LOG_NONE)
     {
         fprintf(stderr, "config file %s invalid log.level\n", cfg_file);
@@ -175,11 +175,23 @@ static int parse_config(struct log_config *config, const char *cfg_file)
     ret = 0;
 
 error_out:
-    if (conf_table)
-    {
-        toml_free(conf_table);
-    }
 
+    if (ptr_output)
+    {
+        free(ptr_output);
+    }
+    if (ptr_file)
+    {
+        free(ptr_file);
+    }
+    if (ptr_level)
+    {
+        free(ptr_level);
+    }
+    if (table)
+    {
+        toml_free(table);
+    }
     if (fp)
     {
         fclose(fp);