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From 91c7cbfe31bbef57d5fcf7d76989fc159f73ef15 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Thu, 18 Aug 2022 13:28:31 +0100
Subject: [PATCH] patch 9.0.0225: using freed memory with multiple line breaks
in expression
Problem: Using freed memory with multiple line breaks in expression.
Solution: Free eval_tofree later.
diff --git a/src/eval.c b/src/eval.c
index 42b883e9b00b..60daca51ce9d 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -353,6 +353,63 @@ eval_to_string_skip(
return retval;
}
+/*
+ * Initialize "evalarg" for use.
+ */
+ void
+init_evalarg(evalarg_T *evalarg)
+{
+ CLEAR_POINTER(evalarg);
+ ga_init2(&evalarg->eval_tofree_ga, sizeof(char_u *), 20);
+}
+
+/*
+ * If "evalarg->eval_tofree" is not NULL free it later.
+ * Caller is expected to overwrite "evalarg->eval_tofree" next.
+ */
+ static void
+free_eval_tofree_later(evalarg_T *evalarg)
+{
+ if (evalarg->eval_tofree != NULL)
+ {
+ if (ga_grow(&evalarg->eval_tofree_ga, 1) == OK)
+ ((char_u **)evalarg->eval_tofree_ga.ga_data)
+ [evalarg->eval_tofree_ga.ga_len++]
+ = evalarg->eval_tofree;
+ else
+ vim_free(evalarg->eval_tofree);
+ }
+}
+
+/*
+ * After using "evalarg" filled from "eap": free the memory.
+ */
+ void
+clear_evalarg(evalarg_T *evalarg, exarg_T *eap)
+{
+ if (evalarg != NULL)
+ {
+ if (evalarg->eval_tofree != NULL)
+ {
+ if (eap != NULL)
+ {
+ // We may need to keep the original command line, e.g. for
+ // ":let" it has the variable names. But we may also need the
+ // new one, "nextcmd" points into it. Keep both.
+ vim_free(eap->cmdline_tofree);
+ eap->cmdline_tofree = *eap->cmdlinep;
+ *eap->cmdlinep = evalarg->eval_tofree;
+ }
+ else
+ vim_free(evalarg->eval_tofree);
+ evalarg->eval_tofree = NULL;
+ }
+
+ ga_clear_strings(&evalarg->eval_tofree_ga);
+ VIM_CLEAR(evalarg->eval_tofree_lambda);
+ }
+}
+
/*
* Skip over an expression at "*pp".
* Return FAIL for an error, OK otherwise.
@@ -435,8 +492,8 @@ skip_expr_concatenate(
// Do not free the first line, the caller can still use it.
*((char_u **)gap->ga_data) = NULL;
// Do not free the last line, "arg" points into it, free it
- // later.
- vim_free(evalarg->eval_tofree);
+ // later. Also free "eval_tofree" later if needed.
+ free_eval_tofree_later(evalarg);
evalarg->eval_tofree =
((char_u **)gap->ga_data)[gap->ga_len - 1];
((char_u **)gap->ga_data)[gap->ga_len - 1] = NULL;
@@ -2274,7 +2331,7 @@ eval_next_line(char_u *arg, evalarg_T *evalarg)
}
else if (evalarg->eval_cookie != NULL)
{
- vim_free(evalarg->eval_tofree);
+ free_eval_tofree_later(evalarg);
evalarg->eval_tofree = line;
}
@@ -2301,45 +2358,6 @@ skipwhite_and_linebreak(char_u *arg, evalarg_T *evalarg)
return p;
}
-/*
- * Initialize "evalarg" for use.
- */
- void
-init_evalarg(evalarg_T *evalarg)
-{
- CLEAR_POINTER(evalarg);
- ga_init2(&evalarg->eval_tofree_ga, sizeof(char_u *), 20);
-}
-
-/*
- * After using "evalarg" filled from "eap": free the memory.
- */
- void
-clear_evalarg(evalarg_T *evalarg, exarg_T *eap)
-{
- if (evalarg != NULL)
- {
- if (evalarg->eval_tofree != NULL)
- {
- if (eap != NULL)
- {
- // We may need to keep the original command line, e.g. for
- // ":let" it has the variable names. But we may also need the
- // new one, "nextcmd" points into it. Keep both.
- vim_free(eap->cmdline_tofree);
- eap->cmdline_tofree = *eap->cmdlinep;
- *eap->cmdlinep = evalarg->eval_tofree;
- }
- else
- vim_free(evalarg->eval_tofree);
- evalarg->eval_tofree = NULL;
- }
-
- ga_clear_strings(&evalarg->eval_tofree_ga);
- VIM_CLEAR(evalarg->eval_tofree_lambda);
- }
-}
-
/*
* The "evaluate" argument: When FALSE, the argument is only parsed but not
* executed. The function may return OK, but the rettv will be of type
diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index e6cd8928d19c..27a13c9498ba 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -9,6 +9,8 @@ int eval_expr_valid_arg(typval_T *tv);
int eval_expr_typval(typval_T *expr, typval_T *argv, int argc, typval_T *rettv);
int eval_expr_to_bool(typval_T *expr, int *error);
char_u *eval_to_string_skip(char_u *arg, exarg_T *eap, int skip);
+void init_evalarg(evalarg_T *evalarg);
+void clear_evalarg(evalarg_T *evalarg, exarg_T *eap);
int skip_expr(char_u **pp, evalarg_T *evalarg);
int skip_expr_concatenate(char_u **arg, char_u **start, char_u **end, evalarg_T *evalarg);
char_u *typval2string(typval_T *tv, int convert);
@@ -34,8 +36,6 @@ int pattern_match(char_u *pat, char_u *text, int ic);
char_u *eval_next_non_blank(char_u *arg, evalarg_T *evalarg, int *getnext);
char_u *eval_next_line(char_u *arg, evalarg_T *evalarg);
char_u *skipwhite_and_linebreak(char_u *arg, evalarg_T *evalarg);
-void init_evalarg(evalarg_T *evalarg);
-void clear_evalarg(evalarg_T *evalarg, exarg_T *eap);
int eval0(char_u *arg, typval_T *rettv, exarg_T *eap, evalarg_T *evalarg);
int eval0_retarg(char_u *arg, typval_T *rettv, exarg_T *eap, evalarg_T *evalarg, char_u **retarg);
int eval1(char_u **arg, typval_T *rettv, evalarg_T *evalarg);
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 56a39efcf79b..597e31ec1c26 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -1560,6 +1560,19 @@ def Test_func_redefine_fails()
v9.CheckScriptFailure(lines, 'E1073:')
enddef
+def Test_lambda_split()
+ # this was using freed memory, because of the split expression
+ var lines =<< trim END
+ vim9script
+ try
+ 0
+ 0->(0
+ ->a.0(
+ ->u
+ END
+ v9.CheckScriptFailure(lines, 'E1050:')
+enddef
+
def Test_fixed_size_list()
# will be allocated as one piece of memory, check that changes work
var l = [1, 2, 3, 4]
diff --git a/src/userfunc.c b/src/userfunc.c
index f612160fc872..e0bdc3fda911 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -1372,7 +1372,6 @@ get_lambda_tv(
char_u *start, *end;
int *old_eval_lavars = eval_lavars_used;
int eval_lavars = FALSE;
- char_u *tofree1 = NULL;
char_u *tofree2 = NULL;
int equal_arrow = **arg == '(';
int white_error = FALSE;
@@ -1457,12 +1456,6 @@ get_lambda_tv(
ret = skip_expr_concatenate(arg, &start, &end, evalarg);
if (ret == FAIL)
goto errret;
- if (evalarg != NULL)
- {
- // avoid that the expression gets freed when another line break follows
- tofree1 = evalarg->eval_tofree;
- evalarg->eval_tofree = NULL;
- }
if (!equal_arrow)
{
@@ -1585,10 +1578,6 @@ get_lambda_tv(
theend:
eval_lavars_used = old_eval_lavars;
- if (evalarg != NULL && evalarg->eval_tofree == NULL)
- evalarg->eval_tofree = tofree1;
- else
- vim_free(tofree1);
vim_free(tofree2);
if (types_optional)
ga_clear_strings(&argtypes);
@@ -1607,10 +1596,6 @@ get_lambda_tv(
}
vim_free(fp);
vim_free(pt);
- if (evalarg != NULL && evalarg->eval_tofree == NULL)
- evalarg->eval_tofree = tofree1;
- else
- vim_free(tofree1);
vim_free(tofree2);
eval_lavars_used = old_eval_lavars;
return FAIL;
|
