Fix still present segmentation fault caused by incrementing index without modulo

packet-exchange/src/send_packet.c

@@ -131,7 +131,8 @@ void send_udp_packet(char *data,
 
   if (params->use_timestamps) {
     clock_gettime(CLOCK_REALTIME, &ts);
-    timestamps_buffer[(ts_buf_write_index++) % TIMESTAMP_BUFFER_SIZE] = ts_to_uint(ts);
+    timestamps_buffer[ts_buf_write_index] = ts_to_uint(ts);
+    ts_buf_write_index = (ts_buf_write_index + 1) % TIMESTAMP_BUFFER_SIZE;
   }
 
   packets_sent++;
@@ -222,7 +223,8 @@ static void process_error_queue() {
 
       struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg);
 
-      int kernel_latency = (ts_to_uint(*stamp) - timestamps_buffer[(ts_buf_read_index++) % TIMESTAMP_BUFFER_SIZE]) / 1000;
+      int kernel_latency = (ts_to_uint(*stamp) - timestamps_buffer[ts_buf_read_index]) / 1000;
+      ts_buf_read_index = (ts_buf_read_index + 1) % TIMESTAMP_BUFFER_SIZE;
 
       stats->min_kernel_latency = min(kernel_latency, stats->min_kernel_latency);
       stats->max_kernel_latency = max(kernel_latency, stats->max_kernel_latency);