From 3ba5240756df606bceab61f863da5287f89ce695 Mon Sep 17 00:00:00 2001
From: random human <random.bored.human@gmail.com>
Date: Wed, 05 Sep 2018 17:15:20 +0530
Subject: [PATCH] Handle size 5 or 6 resulting in stack smashing

---
 src/utf8_fgetch.c | 6 ++++++

diff --git a/src/utf8_fgetch.c b/src/utf8_fgetch.c
index 8fafa55b318ec7f2870d176bc0b9aa26bac32165..d00a79224e1cfaa23bbd02bb40f925229935006e 100644
--- a/src/utf8_fgetch.c
+++ b/src/utf8_fgetch.c
@@ -10,6 +10,12 @@ 		return UTF8_INVALID;
 	}
 	buffer[0] = (char)c;
 	int size = utf8_size(buffer);
+
+	if (size > UTF8_MAX_SIZE) {
+		fseek(f, size - 1, SEEK_CUR);
+		return UTF8_INVALID;
+	}
+
 	if (size > 1) {
 		int amt = fread(&buffer[1], 1, size - 1, f);
 		if (amt != size - 1) {

-- 
2.48.1