use inet_pton to vefify ip address validity

srsepc/src/hss/hss.cc

@@ -170,9 +170,9 @@ bool hss::read_db_file(std::string db_filename)
       if (split[9] == std::string("dynamic")) {
         ue_ctx->static_ip_addr = "0.0.0.0";
       } else {
-        char buf[128];
-        if (inet_ntop(AF_INET, split[9].c_str(), buf, sizeof(buf))) {
-          if (m_ip_to_imsi.insert(std::make_pair(split[8], ue_ctx->imsi)).second) {
+        char buf[128] = {0};
+        if (inet_pton(AF_INET, split[9].c_str(), buf)) {
+          if (m_ip_to_imsi.insert(std::make_pair(split[9], ue_ctx->imsi)).second) {
             ue_ctx->static_ip_addr = split[9];
             m_hss_log->info("static ip addr %s\n", ue_ctx->static_ip_addr.c_str());
           } else {