From b0effae9907e095afb463c3e88cd62049f762166 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
Date: Thu, 28 Nov 2019 20:15:21 +0100
Subject: [PATCH] fpi-ssm: Bug on handler set to a NULL function

We would crash otherwise, while this is quite obvious there was no code
enforcing this.
---
 libfprint/fpi-ssm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libfprint/fpi-ssm.c b/libfprint/fpi-ssm.c
index 0f54b1d..4498ce9 100644
--- a/libfprint/fpi-ssm.c
+++ b/libfprint/fpi-ssm.c
@@ -114,6 +114,7 @@ fpi_ssm_new (FpDevice             *dev,
   FpiSsm *machine;
 
   BUG_ON (nr_states < 1);
+  BUG_ON (handler == NULL);
 
   machine = g_new0 (FpiSsm, 1);
   machine->handler = handler;