From 48156a7a2b1b0515fe2ef9f5d1201e158d5bd948 Mon Sep 17 00:00:00 2001
From: William Poetra Yoga <30787981+wpyh@users.noreply.github.com>
Date: Fri, 7 Jun 2019 23:03:09 +0700
Subject: [PATCH] Prevent Segmentation Fault (#255)

Fix a segmentation fault when no "-b" or "--backlight-preference" option is specified on the command line.
---
 plugins/power/csd-backlight-helper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/plugins/power/csd-backlight-helper.c b/plugins/power/csd-backlight-helper.c
index 3b2e0a06..8d9c1d82 100644
--- a/plugins/power/csd-backlight-helper.c
+++ b/plugins/power/csd-backlight-helper.c
@@ -66,10 +66,12 @@ csd_backlight_helper_get_best_backlight (gchar** preference_list)
 		goto out;
 
 	/* setup our gsettings interface */
-	if (preference_list[0] == NULL)
+	if (preference_list == NULL || preference_list[0] == NULL) {
 		g_print("%s\n%s\n",
 		"Warning: no backlight sources have been configured.",
 		"Check " CSD_POWER_SETTINGS_SCHEMA " to configure some.");
+		goto out;
+	}
 
 	int i = 0;
 	for (i=0; preference_list[i] != NULL; i++) {