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CVE-2022-2126: patch 8.2.5123: using invalid index when looking for spell suggestions · vim/vim@156d391
Out-of-bounds Read in GitHub repository vim/vim prior to 8.2.
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patch 8.2.5123: using invalid index when looking for spell suggestions
Problem: Using invalid index when looking for spell suggestions. Solution: Do not decrement the index when it is zero.
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1 parent 0e8e938 commit 156d3911952d73b03d7420dc3540215247db0fe8
Showing 3 changed files with 14 additions and 1 deletion.
- spellsuggest.c
- test_spell.vim
- version.c
@@ -1973,7 +1973,8 @@ suggest_trie_walk(
sp->ts_isdiff = (newscore != 0)
? DIFF_YES : DIFF_NONE;
}
else if (sp->ts_isdiff == DIFF_INSERT)
else if (sp->ts_isdiff == DIFF_INSERT
&& sp->ts_fidx > 0)
// When inserting trail bytes don’t advance in the
// bad word.
–sp->ts_fidx;
@@ -70,6 +70,16 @@ func Test_z_equal_on_invalid_utf8_word()
bwipe!
endfunc
func Test_z_equal_on_single_character()
" this was decrementing the index below zero
new
norm a0\Ê
norm zW
norm z=
bwipe!
endfunc
" Test spellbadword() with argument
func Test_spellbadword()
set spell
@@ -734,6 +734,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
5123,
/**/
5122,
/**/
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