From b6ddf72bf16960908f9ac43ed763aca621722984 Mon Sep 17 00:00:00 2001
From: Julio B <julio.bacel@gmail.com>
Date: Fri, 26 May 2023 03:48:04 +0300
Subject: [PATCH] fix(mkspell): prevent Unicode character overflow

introduced in: bd22585061b6
fixes #23758

(cherry picked from commit 007ce3a114f721ce31cb71a5c100b241042064a3)
---
 src/nvim/spellfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nvim/spellfile.c b/src/nvim/spellfile.c
index e66b9027f7..499a1fba0a 100644
--- a/src/nvim/spellfile.c
+++ b/src/nvim/spellfile.c
@@ -3127,7 +3127,7 @@ static int spell_read_dic(spellinfo_T *spin, char *fname, afffile_T *affile)
     // Remove CR, LF and white space from the end.  White space halfway through
     // the word is kept to allow multi-word terms like "et al.".
     l = (int)strlen(line);
-    while (l > 0 && line[l - 1] <= ' ') {
+    while (l > 0 && (uint8_t)line[l - 1] <= ' ') {
       l--;
     }
     if (l == 0) {