snmp: initialize session variables to NULL and free peername in exit function

Signed-off-by: k402xxxcenxxx <[email protected]>

Author: k402xxxcenxxx

plugins/in_snmp/in_snmp.c

@@ -2,8 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <net-snmp/net-snmp-config.h>
-#include <net-snmp/net-snmp-includes.h>
-#include <openssl/crypto.h>
+#include <net-snmp/net-snmp-includes.h>\
 #include <msgpack.h>
 #include <fluent-bit/flb_input.h>
 #include <fluent-bit/flb_time.h>
@@ -121,9 +120,9 @@ static int in_snmp_collect(struct flb_input_instance *ins, struct flb_config *co
     int ret = 0;
     struct flb_snmp *ctx = in_context;
 
-    netsnmp_session *ss;
+    netsnmp_session *ss = NULL;
     netsnmp_pdu *pdu;
-    netsnmp_pdu *response;
+    netsnmp_pdu *response = NULL;
 
     oid anOID[MAX_OID_LEN], name[MAX_OID_LEN], end_oid[MAX_OID_LEN];
     size_t anOID_len, name_len, end_len;
@@ -137,7 +136,7 @@ static int in_snmp_collect(struct flb_input_instance *ins, struct flb_config *co
     int buf_overflow = 0;
     bool is_walk = false;
 
-    char *err;
+    char *err = NULL;
 
     if (strcmp(ctx->oid_type, "get") == 0) {
         is_walk = false;
@@ -438,6 +437,9 @@ static int in_snmp_exit(void *data, struct flb_config *config)
 
     flb_log_event_encoder_destroy(&ctx->log_encoder);
 
+    if (ctx->session.peername) {
+        flb_free((void *)ctx->session.peername);
+    }
     flb_free(ctx);
     snmp_shutdown(PLUGIN_NAME);