From 972a96f1a08f85b0a73680e33c02fe5c6c2593df Mon Sep 17 00:00:00 2001
From: Ondrej Mikle <ondrej.mikle@satoshilabs.com>
Date: Wed, 28 Aug 2019 15:55:39 +0200
Subject: [PATCH] core/modtrezorio: raise error when no space left on FAT FS

---
 core/embed/extmod/modtrezorio/modtrezorio-fatfs.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/embed/extmod/modtrezorio/modtrezorio-fatfs.h b/core/embed/extmod/modtrezorio/modtrezorio-fatfs.h
index cdc3649f7..ea72f532b 100644
--- a/core/embed/extmod/modtrezorio/modtrezorio-fatfs.h
+++ b/core/embed/extmod/modtrezorio/modtrezorio-fatfs.h
@@ -184,6 +184,10 @@ STATIC mp_obj_t mod_trezorio_FatFSFile_write(mp_obj_t self, mp_obj_t data) {
   if (res != FR_OK) {
     mp_raise_OSError(fresult_to_errno_table[res]);
   }
+  if (written != buf.len) {
+    /* no space left on device or free clusters recorded in FSInfo fell to 0 */
+    mp_raise_OSError(MP_ENOSPC);
+  }
   return mp_obj_new_int_from_uint(written);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorio_FatFSFile_write_obj, mod_trezorio_FatFSFile_write);