USBCDC: fix buffer overflow when sending more than 64 bytes

Author: facchinm

cores/arduino/USB/USBCDC.cpp

@@ -40,7 +40,11 @@ static const uint8_t cdc_line_coding_default[7] = {0x80, 0x25, 0x00, 0x00, 0x00,
 #define CLS_DTR   (1 << 0)
 #define CLS_RTS   (1 << 1)
 
+#if defined(MBED_CONF_TARGET_USB_SPEED) && (MBED_CONF_TARGET_USB_SPEED == USE_USB_OTG_HS)
+#define CDC_MAX_PACKET_SIZE    512
+#else
 #define CDC_MAX_PACKET_SIZE    64
+#endif
 
 class USBCDC::AsyncWrite: public AsyncOp {
 public:

cores/arduino/USB/USBCDC.h

@@ -207,13 +207,13 @@ class USBCDC: public internal::PluggableUSBModule{
 
     OperationList<AsyncWrite> _tx_list;
     bool _tx_in_progress;
-    uint8_t _tx_buffer[64];
+    uint8_t _tx_buffer[512];
     uint8_t *_tx_buf;
     uint32_t _tx_size;
 
     OperationList<AsyncRead> _rx_list;
     bool _rx_in_progress;
-    uint8_t _rx_buffer[64];
+    uint8_t _rx_buffer[512];
     uint8_t *_rx_buf;
     uint32_t _rx_size;
 };