Mercurial > vim
changeset 29102:fd9006d6ddcf v8.2.5072
patch 8.2.5072: using uninitialized value and freed memory in spell command
Commit: https://github.com/vim/vim/commit/2813f38e021c6e6581c0c88fcf107e41788bc835
Author: Bram Moolenaar <Bram@vim.org>
Date: Thu Jun 9 19:54:24 2022 +0100
patch 8.2.5072: using uninitialized value and freed memory in spell command
Problem: Using uninitialized value and freed memory in spell command.
Solution: Initialize "attr". Check for empty line early.
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Thu, 09 Jun 2022 21:00:04 +0200 |
| parents | 66edb33d194b |
| children | 6ecf51abe41c |
| files | src/spell.c src/testdir/test_spell_utf8.vim src/version.c |
| diffstat | 3 files changed, 24 insertions(+), 3 deletions(-) [+] |
line wrap: on
line diff
--- a/src/spell.c +++ b/src/spell.c @@ -1275,7 +1275,7 @@ spell_move_to( char_u *line; char_u *p; char_u *endp; - hlf_T attr; + hlf_T attr = 0; int len; #ifdef FEAT_SYN_HL int has_syntax = syntax_present(wp); @@ -1308,6 +1308,8 @@ spell_move_to( while (!got_int) { + int empty_line; + line = ml_get_buf(wp->w_buffer, lnum, FALSE); len = (int)STRLEN(line); @@ -1340,7 +1342,9 @@ spell_move_to( } // Copy the line into "buf" and append the start of the next line if - // possible. + // possible. Note: this ml_get_buf() may make "line" invalid, check + // for empty line first. + empty_line = *skipwhite(line) == NUL; STRCPY(buf, line); if (lnum < wp->w_buffer->b_ml.ml_line_count) spell_cat_line(buf + STRLEN(buf), @@ -1487,7 +1491,7 @@ spell_move_to( --capcol; // But after empty line check first word in next line - if (*skipwhite(line) == NUL) + if (empty_line) capcol = 0; }
--- a/src/testdir/test_spell_utf8.vim +++ b/src/testdir/test_spell_utf8.vim @@ -802,5 +802,20 @@ func Test_word_index() call delete('Xtmpfile') endfunc +func Test_check_empty_line() + " This was using freed memory + enew + spellgood! fl + norm z= + norm yy + sil! norm P]svc + norm P]s + + " set 'encoding' to clear the wordt list + set enc=latin1 + set enc=utf-8 + bwipe! +endfunc + " vim: shiftwidth=2 sts=2 expandtab