Enforce proper memory alignment on APDU buffer for response status words

2022-10-03 13:44:50 +02:00
parent fe3f61c7a0
commit d297a66951
1 changed files with 3 additions and 1 deletions
--- a/src_features/signMessageEIP712/commands_712.c
+++ b/src_features/signMessageEIP712/commands_712.c
@@ -28,7 +28,9 @@ void handle_eip712_return_code(bool success) {
    } else if (apdu_response_code == APDU_RESPONSE_OK) {  // somehow not set
        apdu_response_code = APDU_RESPONSE_ERROR_NO_INFO;
    }
-    *(uint16_t *) G_io_apdu_buffer = __builtin_bswap16(apdu_response_code);
+
+    G_io_apdu_buffer[0] = (apdu_response_code >> 8) & 0xff;
+    G_io_apdu_buffer[1] = apdu_response_code & 0xff;

    // Send back the response, do not restart the event loop
    io_exchange(CHANNEL_APDU | IO_RETURN_AFTER_TX, 2);