Clear FIDO data when the FIDO is disabled.

Author: lihuanhuan

core/embed/trezorhal/spi_legacy.c

@@ -359,6 +359,12 @@ uint32_t _spi_slave_poll_ex(uint8_t* buf, bool fido)
             len = total_len > SPI_PKG_SIZE ? SPI_PKG_SIZE : total_len;
             return fifo_read_lock(&spi_fifo_in, buf, len);
         }
+#if BOOT_ONLY
+        else
+        {
+            fifo_flush(&spi_fifo_in);
+        }
+#endif
     }
 
     return 0;

core/src/session.py

@@ -18,10 +18,19 @@
 utils.RESTART_MAIN_LOOP = False
 
 
+async def flush_fido_buffer():
+    from trezor import io
+
+    while True:
+        await loop.wait(io.SPI_FIDO_FACE | io.POLL_READ)
+
+
 if not utils.BITCOIN_ONLY and usb.ENABLE_IFACE_WEBAUTHN:
     import apps.webauthn
 
     apps.webauthn.boot()
+else:
+    loop.schedule(flush_fido_buffer())
 
 if __debug__:
     import apps.debug