From eb41373c8c88b0789e5cf04669d6116f9a199264 Mon Sep 17 00:00:00 2001 From: Minjae Kim 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 --- 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