check out memory allocation

app/src/main/cpp/visualizer/execute_fft.cpp

@@ -193,6 +193,7 @@ int init_visualizer(filter_sys_t *p_filter)
     p_filter->p_prev_s16_buff = nullptr;
 
     auto *w_param = (window_param*) malloc(sizeof(window_param));
+    if (!w_param) return -1;
     p_filter->wind_param = *w_param;
 
     /* Fetch the FFT window parameters */
@@ -207,8 +208,12 @@ int init_visualizer(filter_sys_t *p_filter)
     p_filter->out_samples = FFT_BUFFER_SIZE;
 #endif
     p_filter->output = (int8_t *) (malloc(p_filter->out_samples * sizeof(int8_t)));
+    if (!p_filter->output) return -1;
     p_filter->data_size = MAX_FFT_SIZE;
     p_filter->data = (uint8_t *) (malloc(MAX_FFT_SIZE * sizeof(uint8_t)));
+    if (!p_filter->data) {
+        return -1;
+    }
     return 0;
 }