Merge pull request #3472 from DavidLin1577/patch-2

[components/usb]Fixed a stack overflow bug

components/drivers/usb/usbdevice/class/cdc_vcom.c

@@ -493,6 +493,7 @@ static rt_err_t _function_enable(ufunction_t func)
     
     data = (struct vcom*)func->user_data;
     data->ep_out->buffer = rt_malloc(CDC_RX_BUFSIZE);
+    RT_ASSERT(data->ep_out->buffer != RT_NULL);
 
     data->ep_out->request.buffer = data->ep_out->buffer;
     data->ep_out->request.size = EP_MAXPACKET(data->ep_out);
@@ -593,6 +594,7 @@ ufunction_t rt_usbd_function_cdc_create(udevice_t device)
     
     /* allocate memory for cdc vcom data */
     data = (struct vcom*)rt_malloc(sizeof(struct vcom));
+    RT_ASSERT(data != RT_NULL);
     rt_memset(data, 0, sizeof(struct vcom));
     func->user_data = (void*)data;
     

components/drivers/usb/usbdevice/class/ecm.c

@@ -565,7 +565,8 @@ ufunction_t rt_usbd_function_ecm_create(udevice_t device)
     /* create a cdc class */
     cdc = rt_usbd_function_new(device, &_dev_desc, &ops);
     rt_usbd_device_set_qualifier(device, &dev_qualifier);
-    _ecm_eth= rt_malloc(sizeof(struct rt_ecm_eth)); 
+    _ecm_eth= rt_malloc(sizeof(struct rt_ecm_eth));
+    RT_ASSERT(_ecm_eth != RT_NULL);
     rt_memset(_ecm_eth, 0, sizeof(struct rt_ecm_eth));
     cdc->user_data = _ecm_eth;
 

components/drivers/usb/usbhost/core/hub.c

@@ -508,6 +508,7 @@ static rt_err_t rt_usbh_hub_enable(void *arg)
 
     /* create a hub instance */
     hub = rt_malloc(sizeof(struct uhub));
+    RT_ASSERT(hub != RT_NULL);
     rt_memset(hub, 0, sizeof(struct uhub));
     
     /* make interface instance's user data point to hub instance */