From 9c226f854b4044000f3453e7b39cba8888923ece Mon Sep 17 00:00:00 2001
From: Lucas PASCAL <lucas.pascal@ledger.com>
Date: Tue, 21 May 2024 16:15:33 +0200
Subject: [PATCH] [tmp]

---
 lib_stusb_impl/u2f_impl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib_stusb_impl/u2f_impl.c b/lib_stusb_impl/u2f_impl.c
index 634ae9a5e..c6a87aec7 100644
--- a/lib_stusb_impl/u2f_impl.c
+++ b/lib_stusb_impl/u2f_impl.c
@@ -280,6 +280,18 @@ int u2f_get_cmd_msg_data_length(const uint8_t *buffer, uint16_t length)
         return 0;
     }
 
+    if (length == APDU_MIN_HEADER + 2) {
+        // Short encoding, with either:
+        //  - both Lc (==0) and Le, or
+        //  - Lc == 1 and 1B of data, no Le
+        if (buffer[4] == 0 || buffer[4] == 1) {
+            return buffer[4];
+        }
+        else {
+            return -1;
+        }
+    }
+
     if (length < APDU_MIN_HEADER + 3) {
         // Short encoding or bad length
         // We don't support short encoding