[PATCH] vim: fix CVE-2021-3778

[Minjae Kim <flowergom@gmail.com>]

vim is vulnerable to Heap-based Buffer Overflow

reference:
https://github.com/vim/vim/commit/65b605665997fad54ef39a93199e305af2fe4d7f
---
 .../vim/files/CVE-2021-3778.patch             | 49 +++++++++++++++++++
 meta/recipes-support/vim/vim.inc              |  1 +
 2 files changed, 50 insertions(+)
 create mode 100644 meta/recipes-support/vim/files/CVE-2021-3778.patch

diff --git a/meta/recipes-support/vim/files/CVE-2021-3778.patch b/meta/recipes-support/vim/files/CVE-2021-3778.patch
new file mode 100644
index 0000000000..9cb61a6ac7
--- /dev/null
+++ b/meta/recipes-support/vim/files/CVE-2021-3778.patch
@@ -0,0 +1,49 @@
+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(-)
+
+diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
+index fb512f961..4d337f1f1 100644
+--- a/src/regexp_nfa.c
++++ b/src/regexp_nfa.c
+@@ -5455,7 +5455,8 @@ find_match_text(colnr_T startcol, int regstart, char_u *match_text)
+               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
+diff --git a/src/testdir/test_regexp_utf8.vim b/src/testdir/test_regexp_utf8.vim
+index 19ff882be..e0665818b 100644
+--- a/src/testdir/test_regexp_utf8.vim
++++ b/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
+-- 
+2.17.1
+
diff --git a/meta/recipes-support/vim/vim.inc b/meta/recipes-support/vim/vim.inc
index 7e9225fbcb..db1e9caf4d 100644
--- a/meta/recipes-support/vim/vim.inc
+++ b/meta/recipes-support/vim/vim.inc
@@ -18,6 +18,7 @@ SRC_URI = "git://github.com/vim/vim.git \
            file://no-path-adjust.patch \
            file://racefix.patch \
            file://b7081e135a16091c93f6f5f7525a5c58fb7ca9f9.patch \
+          file://CVE-2021-3778.patch \
 "
 
 SRCREV = "98056533b96b6b5d8849641de93185dd7bcadc44"
-- 
2.25.1