[fix-touch] stop receiving data if the stream is closed

 + add testing signing micheline expression

app/src/ui_stream_nbgl.c

@@ -321,7 +321,7 @@ tz_ui_nav_cb(void)
     tz_parser_state        *st = &global.keys.apdu.sign.u.clear.parser_state;
 
     // Continue receiving data from the apdu until s->full is true.
-    while (((s->total < 0) || ((s->current == s->total) && !s->full))
+    while (((s->total < 0) || (s->current == s->total)) && !s->full
            && (st->errno < TZ_ERR_INVALID_TAG)) {
         PRINTF("tz_ui_nav_cb: Looping...\n");
         tz_ui_continue();

tests/integration/touch/test_sign_micheline.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+# Copyright 2023 Trilitech <[email protected]>
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from utils import (
+    tezos_app,
+    send_payload
+)
+
+# full input: 0502000000080100000001300000
+# full output: Expression {"0";0}
+
+if __name__ == "__main__":
+    app = tezos_app(__file__)
+
+    app.assert_home()
+
+    app.send_initialize_msg("8004000011048000002c800006c18000000080000000")
+    send_payload(app, "800481ff0e0502000000080100000001300000")
+
+    app.review.next()
+    app.assert_screen("micheline_screen")
+
+    expected_apdu = "c871155802f26f35ea07a15c8002d836a8779ac8cc2feb0141f08831dad0326a0905cd4fc8f00615b7b4a78e7eaf7fcc0b7959e01e3119b6261ebd71d76d580b9000"
+    app.review_confirm_signing(expected_apdu)
+
+    app.assert_home()
+    app.quit()