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diff --git a/term/usb_keyboard.c b/term/usb_keyboard.c
index 5fcb570b771b24db533301cdf12b7a4f1911ea33..62f5df352fc34ed58041427311e30d31c07225e0 100644 (file)
--- a/term/usb_keyboard.c
+++ b/term/usb_keyboard.c
@@ -220,8 +220,7 @@ grub_usb_keyboard_checkkey (struct grub_term_input *term)
   err = grub_usb_bulk_read_extended (termdata->usbdev,
                                     termdata->endp->endp_addr, sizeof (data),
                                     (char *) data, 10, &actual);
-
-  if (err)
+  if (err || actual < 1)
     return -1;
 
   termdata->status = data[0];