Fix segmentation fault

packet-exchange/src/client.c

@@ -232,6 +232,7 @@ int main(int argc, char *argv[]) {
 // Critical TSN task
 static void do_tsn_task(struct thread_param *param, uint64_t next_txtime) {
   struct timespec t1, t2;
+  uint64_t rtt_us;
 
   // One way packet sending
   if (tsn_task == SEND_PACKET_TASK) {
@@ -251,8 +252,14 @@ static void do_tsn_task(struct thread_param *param, uint64_t next_txtime) {
 
     param->stats.rtt = calcdiff_ns(t2, t1);
 
-    if(enable_histograms)
+    if(enable_histograms) {
+      rtt_us = param->stats.rtt / 1000;
+      if(rtt_us > MAX_HIST_VAL) {
+        fprintf(stderr, "RTT value higher than MAX_HIST_VAL : %" PRIu64 " ( > %" PRIu64 ")\n", rtt_us, MAX_HIST_VAL);
+        exit(EXIT_FAILURE);
+      }
       histograms[0][param->stats.rtt]++;
+    }
   }
 }