From 86c766d25c85efbe8efb1dd728783bd1080b7e23 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <pj@pehjota.net>
Date: Sun, 05 Nov 2017 16:07:36 -0500
Subject: mq_html_document*(): Don't dereference styles pointer if NULL

---
diff --git a/src/utils/html.c b/src/utils/html.c
index 936ba05..95d7cdc 100644
--- a/src/utils/html.c
+++ b/src/utils/html.c
@@ -210,7 +210,9 @@ mq_html_document(const gchar *title, const gchar *styles,
 	len += strlen(title);
 	len += strlen("</title>\n<style>\n");
 	len += strlen(global_styles);
-	len += strlen(styles);
+	if (styles) {
+		len += strlen(styles);
+	}
 	len += strlen("</style>\n");
 	if (head_tags) {
 		len += strlen(head_tags);
@@ -233,7 +235,9 @@ mq_html_document(const gchar *title, const gchar *styles,
 	ptr = g_stpcpy(ptr, title);
 	ptr = g_stpcpy(ptr, "</title>\n<style>\n");
 	ptr = g_stpcpy(ptr, global_styles);
-	ptr = g_stpcpy(ptr, styles);
+	if (styles) {
+		ptr = g_stpcpy(ptr, styles);
+	}
 	ptr = g_stpcpy(ptr, "</style>\n");
 	if (head_tags) {
 		ptr = g_stpcpy(ptr, head_tags);
@@ -266,7 +270,9 @@ mq_html_document_v(const gchar *title, const gchar *styles,
 	len += strlen(title);
 	len += strlen("</title>\n<style>\n");
 	len += strlen(global_styles);
-	len += strlen(styles);
+	if (styles) {
+		len += strlen(styles);
+	}
 	len += strlen("</style>\n");
 	if (head_tags) {
 		len += strlen(head_tags);
@@ -287,7 +293,9 @@ mq_html_document_v(const gchar *title, const gchar *styles,
 	ptr = g_stpcpy(ptr, title);
 	ptr = g_stpcpy(ptr, "</title>\n<style>\n");
 	ptr = g_stpcpy(ptr, global_styles);
-	ptr = g_stpcpy(ptr, styles);
+	if (styles) {
+		ptr = g_stpcpy(ptr, styles);
+	}
 	ptr = g_stpcpy(ptr, "</style>\n");
 	if (head_tags) {
 		ptr = g_stpcpy(ptr, head_tags);
--
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