From ce856efa257587359a5c4d6b9c990dd134724a70 Mon Sep 17 00:00:00 2001
From: Bastien Nocera <hadess@hadess.net>
Date: Wed, 12 Dec 2018 16:30:26 +0100
Subject: [PATCH] elan: Assert on a possible division by zero in
 elan_need_calibration()

libfprint/drivers/elan.c:598:10: warning: Division by zero
        bg_mean /= frame_size;
        ~~~~~~~~^~~~~~~~~~~~~
---
 libfprint/drivers/elan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libfprint/drivers/elan.c b/libfprint/drivers/elan.c
index ea84e7c..3020f05 100644
--- a/libfprint/drivers/elan.c
+++ b/libfprint/drivers/elan.c
@@ -595,6 +595,8 @@ static int elan_need_calibration(struct elan_dev *elandev)
 	unsigned int bg_mean = 0, delta;
 	unsigned int frame_size = elandev->frame_width * elandev->frame_height;
 
+	g_assert(frame_size != 0);
+
 	for (int i = 0; i < frame_size; i++)
 		bg_mean += elandev->background[i];
 	bg_mean /= frame_size;