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From eb41373c8c88b0789e5cf04669d6116f9a199264 Mon Sep 17 00:00:00 2001
From: Minjae Kim <flowergom@gmail.com>
Date: Sun, 26 Sep 2021 23:48:00 +0000
Subject: [PATCH] patch 8.2.3409: reading beyond end of line with invalid utf-8
character
Problem: Reading beyond end of line with invalid utf-8 character.
Solution: Check for NUL when advancing.
Upstream-Status: Accepted [https://github.com/vim/vim/commit/65b605665997fad54ef39a93199e305af2fe4d7f]
CVE: CVE-2021-3778
Signed-off-by: Minjae Kim <flowergom@gmail.com>
---
src/regexp_nfa.c | 3 ++-
src/testdir/test_regexp_utf8.vim | 7 +++++++
2 files changed, 9 insertions(+), 1 deletion(-)
Index: git/src/regexp_nfa.c
===================================================================
--- git.orig/src/regexp_nfa.c
+++ git/src/regexp_nfa.c
@@ -5455,7 +5455,8 @@ find_match_text(colnr_T startcol, int re
match = FALSE;
break;
}
- len2 += MB_CHAR2LEN(c2);
+ len2 += enc_utf8 ? utf_ptr2len(rex.line + col + len2)
+ : MB_CHAR2LEN(c2);
}
if (match
// check that no composing char follows
Index: git/src/testdir/test_regexp_utf8.vim
===================================================================
--- git.orig/src/testdir/test_regexp_utf8.vim
+++ git/src/testdir/test_regexp_utf8.vim
@@ -215,3 +215,10 @@ func Test_optmatch_toolong()
set re=0
endfunc
+func Test_match_invalid_byte()
+ call writefile(0z630a.765d30aa0a.2e0a.790a.4030, 'Xinvalid')
+ new
+ source Xinvalid
+ bwipe!
+ call delete('Xinvalid')
+endfunc
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