From 60b2dcfbb9edc4c4138616a4797741af0d0b7116 Mon Sep 17 00:00:00 2001
From: Michael Cardell Widerkrantz <mc@tillitis.se>
Date: Thu, 3 Nov 2022 12:23:40 +0100
Subject: [PATCH] fw: Don't allow an app size of 0

---
 hw/application_fpga/fw/tk1/main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/application_fpga/fw/tk1/main.c b/hw/application_fpga/fw/tk1/main.c
index b2fec00..0cec2e0 100644
--- a/hw/application_fpga/fw/tk1/main.c
+++ b/hw/application_fpga/fw/tk1/main.c
@@ -245,7 +245,8 @@ int main()
 			putinthex(local_app_size);
 			lf();
 
-			if (local_app_size > TK1_APP_MAX_SIZE) {
+			if (local_app_size == 0 ||
+			    local_app_size > TK1_APP_MAX_SIZE) {
 				rsp[0] = STATUS_BAD;
 				fwreply(hdr, FW_RSP_LOAD_APP, rsp);
 				break;