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eval/typval_encode: Fix infinite loop

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Occurs when trying to dump a partial with attached self dictionary which
references that partial. “Infinite” loop should normally result in Neovim killed
by OOM killer.

Also moved the place when partials are unreferenced by clear_tv: from
…FUNC_START to …FUNC_END.
This commit is contained in:
ZyX
2016-12-25 23:29:35 +03:00
parent affa3c2baa
commit 759e736b0a
4 changed files with 134 additions and 39 deletions
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96
src/nvim/eval/typval_encode.c.h
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@@ -166,7 +166,8 @@
///
/// After including this file it will define function
/// `encode_vim_to_{TYPVAL_ENCODE_NAME}` with scope #TYPVAL_ENCODE_SCOPE and
/// static function `_{TYPVAL_ENCODE_NAME}_convert_one_value`.
/// static functions `_typval_encode_{TYPVAL_ENCODE_NAME}_convert_one_value` and
/// `_typval_encode_{TYPVAL_ENCODE_NAME}_check_self_reference`.
/// @def TYPVAL_ENCODE_FIRST_ARG_TYPE
/// @brief Type of the first argument, which will be used to return the results
@@ -192,11 +193,50 @@
#include "nvim/func_attr.h"
#include "nvim/eval/typval_encode.h"
static inline int _TYPVAL_ENCODE_CHECK_SELF_REFERENCE(
TYPVAL_ENCODE_FIRST_ARG_TYPE TYPVAL_ENCODE_FIRST_ARG_NAME,
void *const val, int *const val_copyID,
const MPConvStack *const mpstack, const int copyID,
const MPConvStackValType conv_type,
const char *const objname)
REAL_FATTR_NONNULL_ARG(2, 3, 4, 7) REAL_FATTR_WARN_UNUSED_RESULT
REAL_FATTR_ALWAYS_INLINE;
/// Function for checking whether container references itself
///
/// @param TYPVAL_ENCODE_FIRST_ARG_NAME First argument.
/// @param[in,out] val Container to check.
/// @param val_copyID Pointer to the container attribute that holds copyID.
/// After checking whether value of this attribute is
/// copyID (variable) it is set to copyID.
/// @param[in] mpstack Stack with values to convert. Read-only, used for error
/// reporting.
/// @param[in] copyID CopyID used by the caller.
/// @param[in] conv_type Type of the conversion, @see MPConvStackValType.
/// @param[in] objname Object name, used for error reporting.
///
/// @return NOTDONE in case of success, what to return in case of failure.
static inline int _TYPVAL_ENCODE_CHECK_SELF_REFERENCE(
TYPVAL_ENCODE_FIRST_ARG_TYPE TYPVAL_ENCODE_FIRST_ARG_NAME,
void *const val, int *const val_copyID,
const MPConvStack *const mpstack, const int copyID,
const MPConvStackValType conv_type,
const char *const objname)
{
if (*val_copyID == copyID) {
TYPVAL_ENCODE_CONV_RECURSE(val, conv_type);
return OK;
}
*val_copyID = copyID;
return NOTDONE;
}
static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
TYPVAL_ENCODE_FIRST_ARG_TYPE TYPVAL_ENCODE_FIRST_ARG_NAME,
MPConvStack *const mpstack, typval_T *const tv, const int copyID,
MPConvStack *const mpstack, MPConvStackVal *const cur_mpsv,
typval_T *const tv, const int copyID,
const char *const objname)
REAL_FATTR_NONNULL_ALL REAL_FATTR_WARN_UNUSED_RESULT;
REAL_FATTR_NONNULL_ARG(2, 4, 6) REAL_FATTR_WARN_UNUSED_RESULT;
/// Convert single value
///
@@ -206,9 +246,10 @@ static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
/// @param TYPVAL_ENCODE_FIRST_ARG_NAME First argument, defined by the
/// includer. Only meaningful to macros
/// defined by the includer.
/// @param[out] mpstack Stack with values to convert. Values which are not
/// converted completely by this function (i.e.
/// non-scalars) are pushed here.
/// @param mpstack Stack with values to convert. Values which are not
/// converted completely by this function (i.e.
/// non-scalars) are pushed here.
/// @param cur_mpsv Currently converted value from stack.
/// @param tv Converted value.
/// @param[in] copyID CopyID.
/// @param[in] objname Object name, used for error reporting.
@@ -216,7 +257,8 @@ static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
/// @return OK in case of success, FAIL in case of failure.
static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
TYPVAL_ENCODE_FIRST_ARG_TYPE TYPVAL_ENCODE_FIRST_ARG_NAME,
MPConvStack *const mpstack, typval_T *const tv, const int copyID,
MPConvStack *const mpstack, MPConvStackVal *const cur_mpsv,
typval_T *const tv, const int copyID,
const char *const objname)
{
switch (tv->v_type) {
@@ -260,8 +302,8 @@ static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
TYPVAL_ENCODE_CONV_EMPTY_LIST();
break;
}
_TYPVAL_ENCODE_CHECK_SELF_REFERENCE(tv->vval.v_list, lv_copyID, copyID,
kMPConvList);
_TYPVAL_ENCODE_DO_CHECK_SELF_REFERENCE(tv->vval.v_list, lv_copyID, copyID,
kMPConvList);
TYPVAL_ENCODE_CONV_LIST_START(tv->vval.v_list->lv_len);
_mp_push(*mpstack, ((MPConvStackVal) {
.type = kMPConvList,
@@ -392,8 +434,9 @@ static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
if (val_di->di_tv.v_type != VAR_LIST) {
goto _convert_one_value_regular_dict;
}
_TYPVAL_ENCODE_CHECK_SELF_REFERENCE(val_di->di_tv.vval.v_list,
lv_copyID, copyID, kMPConvList);
_TYPVAL_ENCODE_DO_CHECK_SELF_REFERENCE(val_di->di_tv.vval.v_list,
lv_copyID, copyID,
kMPConvList);
TYPVAL_ENCODE_CONV_LIST_START(val_di->di_tv.vval.v_list->lv_len);
_mp_push(*mpstack, ((MPConvStackVal) {
.tv = tv,
@@ -423,8 +466,8 @@ static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
goto _convert_one_value_regular_dict;
}
}
_TYPVAL_ENCODE_CHECK_SELF_REFERENCE(val_list, lv_copyID, copyID,
kMPConvPairs);
_TYPVAL_ENCODE_DO_CHECK_SELF_REFERENCE(val_list, lv_copyID, copyID,
kMPConvPairs);
TYPVAL_ENCODE_CONV_DICT_START(val_list->lv_len);
_mp_push(*mpstack, ((MPConvStackVal) {
.tv = tv,
@@ -464,8 +507,8 @@ static int _TYPVAL_ENCODE_CONVERT_ONE_VALUE(
break;
}
_convert_one_value_regular_dict:
_TYPVAL_ENCODE_CHECK_SELF_REFERENCE(tv->vval.v_dict, dv_copyID, copyID,
kMPConvDict);
_TYPVAL_ENCODE_DO_CHECK_SELF_REFERENCE(tv->vval.v_dict, dv_copyID, copyID,
kMPConvDict);
TYPVAL_ENCODE_CONV_DICT_START(tv->vval.v_dict->dv_hashtab.ht_used);
_mp_push(*mpstack, ((MPConvStackVal) {
.tv = tv,
@@ -491,7 +534,7 @@ _convert_one_value_regular_dict:
TYPVAL_ENCODE_SCOPE int _TYPVAL_ENCODE_ENCODE(
TYPVAL_ENCODE_FIRST_ARG_TYPE TYPVAL_ENCODE_FIRST_ARG_NAME,
typval_T *const tv, const char *const objname)
REAL_FATTR_WARN_UNUSED_RESULT;
REAL_FATTR_NONNULL_ARG(2, 3) REAL_FATTR_WARN_UNUSED_RESULT;
/// Convert the whole typval
///
@@ -510,6 +553,7 @@ TYPVAL_ENCODE_SCOPE int _TYPVAL_ENCODE_ENCODE(
MPConvStack mpstack;
_mp_init(mpstack);
if (_TYPVAL_ENCODE_CONVERT_ONE_VALUE(TYPVAL_ENCODE_FIRST_ARG_NAME, &mpstack,
NULL,
tv, copyID, objname)
== FAIL) {
goto encode_vim_to__error_ret;
@@ -566,7 +610,7 @@ TYPVAL_ENCODE_SCOPE int _TYPVAL_ENCODE_ENCODE(
TYPVAL_ENCODE_CONV_SPECIAL_DICT_KEY_CHECK(
encode_vim_to__error_ret, kv_pair->lv_first->li_tv);
if (_TYPVAL_ENCODE_CONVERT_ONE_VALUE(TYPVAL_ENCODE_FIRST_ARG_NAME,
&mpstack,
&mpstack, cur_mpsv,
&kv_pair->lv_first->li_tv,
copyID,
objname) == FAIL) {
@@ -587,7 +631,7 @@ TYPVAL_ENCODE_SCOPE int _TYPVAL_ENCODE_ENCODE(
TYPVAL_ENCODE_CONV_LIST_START(pt->pt_argc);
_mp_push(mpstack, ((MPConvStackVal) {
.type = kMPConvPartialList,
.tv = tv,
.tv = NULL,
.data = {
.a = {
.arg = pt->pt_argv,
@@ -604,10 +648,21 @@ TYPVAL_ENCODE_SCOPE int _TYPVAL_ENCODE_ENCODE(
dict_T *const dict = pt == NULL ? NULL : pt->pt_dict;
if (dict != NULL) {
TYPVAL_ENCODE_CONV_FUNC_BEFORE_SELF(dict->dv_hashtab.ht_used);
const int te_csr_ret = _TYPVAL_ENCODE_CHECK_SELF_REFERENCE(
TYPVAL_ENCODE_FIRST_ARG_NAME,
dict, &dict->dv_copyID, &mpstack, copyID, kMPConvDict,
objname);
if (te_csr_ret != NOTDONE) {
if (te_csr_ret == FAIL) {
goto encode_vim_to__error_ret;
} else {
continue;
}
}
TYPVAL_ENCODE_CONV_DICT_START(dict->dv_hashtab.ht_used);
_mp_push(mpstack, ((MPConvStackVal) {
.type = kMPConvDict,
.tv = tv,
.tv = NULL,
.data = {
.d = {
.dict = dict,
@@ -644,7 +699,8 @@ TYPVAL_ENCODE_SCOPE int _TYPVAL_ENCODE_ENCODE(
}
assert(cur_tv != NULL);
if (_TYPVAL_ENCODE_CONVERT_ONE_VALUE(TYPVAL_ENCODE_FIRST_ARG_NAME, &mpstack,
cur_tv, copyID, objname) == FAIL) {
cur_mpsv, cur_tv, copyID, objname)
== FAIL) {
goto encode_vim_to__error_ret;
}
}