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From: Markus Koschany <apo@debian.org>
Date: Wed, 19 Oct 2022 19:21:36 +0200
Subject: CVE-2021-3928
Origin: https://github.com/vim/vim/commit/15d9890eee53afc61eb0a03b878a19cb5672f732
---
src/spell.c | 2 +-
src/testdir/test_spell.vim | 10 ++++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
--- a/src/spell.c
+++ b/src/spell.c
@@ -4616,7 +4616,7 @@ suggest_trie_walk(
* char, e.g., "thes," -> "these". */
p = fword + sp->ts_fidx;
MB_PTR_BACK(fword, p);
- if (!spell_iswordp(p, curwin))
+ if (!spell_iswordp(p, curwin) && *preword != NUL)
{
p = preword + STRLEN(preword);
MB_PTR_BACK(preword, p);
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -436,6 +436,16 @@ func RunGoodBad(good, bad, expected_word
bwipe!
endfunc
+func Test_spell_single_word()
+ set spell
+ new
+ silent! norm 0R00
+ spell! ��
+ silent 0norm 0r$ Dvz=
+ set nospell
+ bwipe!
+endfunc
+
let g:test_data_aff1 = [
\"SET ISO8859-1",
\"TRY esianrtolcdugmphbyfvkwjkqxz-\xEB\xE9\xE8\xEA\xEF\xEE\xE4\xE0\xE2\xF6\xFC\xFB'ESIANRTOLCDUGMPHBYFVKWJKQXZ",
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