From f2aef8c13ca9f31a2cde75c8c566d077ccebc2af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Helleu?= <flashcode@flashtux.org>
Date: Wed, 26 Jan 2022 20:24:31 +0100
Subject: [PATCH] core: check that utf_char is not NULL in gui chat functions

---
 src/gui/gui-chat.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gui/gui-chat.c b/src/gui/gui-chat.c
index 7620a6344..e8838b72c 100644
--- a/src/gui/gui-chat.c
+++ b/src/gui/gui-chat.c
@@ -138,6 +138,9 @@ gui_chat_prefix_build ()
 int
 gui_chat_utf_char_valid (const char *utf_char)
 {
+    if (!utf_char)
+        return 0;
+
     /* chars below 32 are not valid (except TAB) */
     if (((unsigned char)utf_char[0] < 32) && (utf_char[0] != '\t'))
         return 0;
@@ -159,6 +162,9 @@ gui_chat_utf_char_valid (const char *utf_char)
 int
 gui_chat_char_size_screen (const char *utf_char)
 {
+    if (!utf_char)
+        return 0;
+
     /* if char is invalid, it will be displayed as one space on screen */
     if (!gui_chat_utf_char_valid (utf_char))
         return 1;