From f6f6e8593a81f5fdcec4e361c28e861bee23fe62 Mon Sep 17 00:00:00 2001
From: Pavol Rusnak <stick@gk2.sk>
Date: Wed, 24 Jan 2018 00:36:32 +0100
Subject: [PATCH] bootloader: don't crash on empty usb queue

---
 embed/bootloader/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/embed/bootloader/main.c b/embed/bootloader/main.c
index 00d18042..f7f70e38 100644
--- a/embed/bootloader/main.c
+++ b/embed/bootloader/main.c
@@ -210,7 +210,9 @@ static secbool bootloader_loop(secbool firmware_present)
 #else
         int r = usb_hid_read_blocking(USB_IFACE_NUM, buf, USB_PACKET_SIZE, USB_TIMEOUT);
 #endif
-        ensure(sectrue * (r == USB_PACKET_SIZE), NULL);
+        if (r != USB_PACKET_SIZE) {
+            continue;
+        }
         uint16_t msg_id;
         uint32_t msg_size;
         if (sectrue != msg_parse_header(buf, &msg_id, &msg_size)) {