Headline
CVE-2022-2817: patch 9.0.0213: using freed memory with error in assert argument · vim/vim@249e1b9
Use After Free in GitHub repository vim/vim prior to 9.0.0212.
@@ -597,6 +597,7 @@ f_assert_fails(typval_T *argvars, typval_T *rettv)
int save_trylevel = trylevel;
int called_emsg_before = called_emsg;
char *wrong_arg_msg = NULL;
char_u *tofree = NULL;
if (check_for_string_or_number_arg(argvars, 0) == FAIL
|| check_for_opt_string_or_list_arg(argvars, 1) == FAIL
@@ -660,13 +661,17 @@ f_assert_fails(typval_T *argvars, typval_T *rettv)
}
else if (list->lv_len == 2)
{
tv = &list->lv_u.mat.lv_last->li_tv;
actual = get_vim_var_str(VV_ERRMSG);
expected = tv_get_string_buf_chk(tv, buf);
if (!pattern_match(expected, actual, FALSE))
// make a copy, an error in pattern_match() may free it
tofree = actual = vim_strsave(get_vim_var_str(VV_ERRMSG));
if (actual != NULL)
{
error_found = TRUE;
expected_str = expected;
tv = &list->lv_u.mat.lv_last->li_tv;
expected = tv_get_string_buf_chk(tv, buf);
if (!pattern_match(expected, actual, FALSE))
{
error_found = TRUE;
expected_str = expected;
}
}
}
}
@@ -749,6 +754,7 @@ f_assert_fails(typval_T *argvars, typval_T *rettv)
msg_scrolled = 0;
lines_left = Rows;
VIM_CLEAR(emsg_assert_fails_msg);
vim_free(tofree);
set_vim_var_string(VV_ERRMSG, NULL, 0);
if (wrong_arg_msg != NULL)
emsg(_(wrong_arg_msg));
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