From 289d8276ebb977304f5074bd1e4626d2e98215dd Mon Sep 17 00:00:00 2001
From: Andrew Kozlik <42678794+andrewkozlik@users.noreply.github.com>
Date: Sat, 11 Jan 2020 14:33:24 +0100
Subject: [PATCH] core/fido2: check for HID timeout in send_cmd() (#791)

---
 core/src/apps/webauthn/fido2.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/src/apps/webauthn/fido2.py b/core/src/apps/webauthn/fido2.py
index fad5280107..9ef33f9277 100644
--- a/core/src/apps/webauthn/fido2.py
+++ b/core/src/apps/webauthn/fido2.py
@@ -477,7 +477,10 @@ async def send_cmd(cmd: Cmd, iface: io.HID) -> None:
         if copied < _FRAME_CONT_SIZE:
             frm.data[copied:] = bytearray(_FRAME_CONT_SIZE - copied)
         while True:
-            await write
+            ret = await loop.race(write, loop.sleep(_CTAP_HID_TIMEOUT_MS * 1000))
+            if ret is not None:
+                raise TimeoutError
+
             if iface.write(buf) > 0:
                 break
         seq += 1