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BUG#18037: Fix stack corruption in THD::rollback_item_tree_changes().

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Stored procedure execution sometimes placed the address of auto variables
in the list of Item changes to undo in THD::rollback_item_tree_changes().
This could cause stack corruption.


sql/sp_head.cc:
  Avoid storing address of auto variables in global rollback list, to
  prevent stack memory corruption.
sql/sp_head.h:
  Avoid storing address of auto variables in global rollback list, to
  prevent stack memory corruption.
sql/sp_rcontext.cc:
  Avoid storing address of auto variables in global rollback list, to
  prevent stack memory corruption.
sql/sp_rcontext.h:
  Avoid storing address of auto variables in global rollback list, to
  prevent stack memory corruption.
sql/sql_class.cc:
  Avoid storing address of auto variables in global rollback list, to
  prevent stack memory corruption.
This commit is contained in:
unknown 2006-05-15 12:01:55 +02:00
parent afe4715242
commit dccd333ecf
5 changed files with 28 additions and 25 deletions
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28
sql/sp_head.cc
View file

@ -310,11 +310,13 @@ sp_prepare_func_item(THD* thd, Item **it_addr)
*/
bool
sp_eval_expr(THD *thd, Field *result_field, Item *expr_item)
sp_eval_expr(THD *thd, Field *result_field, Item **expr_item_ptr)
{
Item *expr_item;
DBUG_ENTER("sp_eval_expr");
if (!(expr_item= sp_prepare_func_item(thd, &expr_item)))
if (!(expr_item= sp_prepare_func_item(thd, expr_item_ptr)))
DBUG_RETURN(TRUE);
bool err_status= FALSE;
@ -1269,7 +1271,7 @@ sp_head::execute_function(THD *thd, Item **argp, uint argcount,
param_values[i]= Item_cache::get_cache(argp[i]->result_type());
param_values[i]->store(argp[i]);
if (nctx->set_variable(thd, i, param_values[i]))
if (nctx->set_variable(thd, i, (struct Item **)&(param_values[i])))
{
err_status= TRUE;
break;
@ -1467,7 +1469,7 @@ sp_head::execute_procedure(THD *thd, List<Item> *args)
Item_null *null_item= new Item_null();
if (!null_item ||
nctx->set_variable(thd, i, null_item))
nctx->set_variable(thd, i, (struct Item **)&null_item))
{
err_status= TRUE;
break;
@ -1475,7 +1477,7 @@ sp_head::execute_procedure(THD *thd, List<Item> *args)
}
else
{
if (nctx->set_variable(thd, i, *it_args.ref()))
if (nctx->set_variable(thd, i, it_args.ref()))
{
err_status= TRUE;
break;
@ -1531,7 +1533,7 @@ sp_head::execute_procedure(THD *thd, List<Item> *args)
{
if (octx->set_variable(thd,
((Item_splocal*) arg_item)->get_var_idx(),
nctx->get_item(i)))
nctx->get_item_addr(i)))
{
err_status= TRUE;
break;
@ -1543,15 +1545,15 @@ sp_head::execute_procedure(THD *thd, List<Item> *args)
if (guv)
{
Item *item= nctx->get_item(i);
Item **item= nctx->get_item_addr(i);
Item_func_set_user_var *suv;
suv= new Item_func_set_user_var(guv->get_name(), item);
suv= new Item_func_set_user_var(guv->get_name(), *item);
/*
Item_func_set_user_var is not fixed after construction,
call fix_fields().
*/
if ((err_status= test(!suv || suv->fix_fields(thd, &item) ||
if ((err_status= test(!suv || suv->fix_fields(thd, item) ||
suv->check() || suv->update())))
break;
}
@ -2328,7 +2330,7 @@ sp_instr_set::execute(THD *thd, uint *nextp)
int
sp_instr_set::exec_core(THD *thd, uint *nextp)
{
int res= thd->spcont->set_variable(thd, m_offset, m_value);
int res= thd->spcont->set_variable(thd, m_offset, &m_value);
if (res && thd->spcont->found_handler_here())
{
@ -2603,7 +2605,7 @@ sp_instr_freturn::exec_core(THD *thd, uint *nextp)
do it in scope of execution the current context/block.
*/
return thd->spcont->set_return_value(thd, m_value);
return thd->spcont->set_return_value(thd, &m_value);
}
void
@ -3047,7 +3049,7 @@ sp_instr_set_case_expr::execute(THD *thd, uint *nextp)
int
sp_instr_set_case_expr::exec_core(THD *thd, uint *nextp)
{
int res= thd->spcont->set_case_expr(thd, m_case_expr_id, m_case_expr);
int res= thd->spcont->set_case_expr(thd, m_case_expr_id, &m_case_expr);
if (res &&
!thd->spcont->get_case_expr(m_case_expr_id) &&
@ -3061,7 +3063,7 @@ sp_instr_set_case_expr::exec_core(THD *thd, uint *nextp)
Item *null_item= new Item_null();
if (!null_item ||
thd->spcont->set_case_expr(thd, m_case_expr_id, null_item))
thd->spcont->set_case_expr(thd, m_case_expr_id, &null_item))
{
/* If this also failed, we have to abort. */

2
sql/sp_head.h
View file

@ -1169,6 +1169,6 @@ Item *
sp_prepare_func_item(THD* thd, Item **it_addr);
bool
sp_eval_expr(THD *thd, Field *result_field, Item *expr_item);
sp_eval_expr(THD *thd, Field *result_field, Item **expr_item_ptr);
#endif /* _SP_HEAD_H_ */

13
sql/sp_rcontext.cc
View file

@ -150,7 +150,7 @@ sp_rcontext::init_var_items()
bool
sp_rcontext::set_return_value(THD *thd, Item *return_value_item)
sp_rcontext::set_return_value(THD *thd, Item **return_value_item)
{
DBUG_ASSERT(m_return_value_fld);
@ -279,14 +279,14 @@ sp_rcontext::pop_cursors(uint count)
int
sp_rcontext::set_variable(THD *thd, uint var_idx, Item *value)
sp_rcontext::set_variable(THD *thd, uint var_idx, Item **value)
{
return set_variable(thd, m_var_table->field[var_idx], value);
}
int
sp_rcontext::set_variable(THD *thd, Field *field, Item *value)
sp_rcontext::set_variable(THD *thd, Field *field, Item **value)
{
if (!value)
{
@ -478,9 +478,10 @@ sp_rcontext::create_case_expr_holder(THD *thd, Item_result result_type)
*/
int
sp_rcontext::set_case_expr(THD *thd, int case_expr_id, Item *case_expr_item)
sp_rcontext::set_case_expr(THD *thd, int case_expr_id, Item **case_expr_item_ptr)
{
if (!(case_expr_item= sp_prepare_func_item(thd, &case_expr_item)))
Item *case_expr_item= sp_prepare_func_item(thd, case_expr_item_ptr);
if (!case_expr_item)
return TRUE;
if (!m_case_expr_holders[case_expr_id] ||
@ -542,7 +543,7 @@ bool Select_fetch_into_spvars::send_data(List<Item> &items)
*/
for (; spvar= spvar_iter++, item= item_iter++; )
{
if (thd->spcont->set_variable(thd, spvar->offset, item))
if (thd->spcont->set_variable(thd, spvar->offset, &item))
return TRUE;
}
return FALSE;

8
sql/sp_rcontext.h
View file

@ -91,7 +91,7 @@ class sp_rcontext : public Sql_alloc
~sp_rcontext();
int
set_variable(THD *thd, uint var_idx, Item *value);
set_variable(THD *thd, uint var_idx, Item **value);
Item *
get_item(uint var_idx);
@ -100,7 +100,7 @@ class sp_rcontext : public Sql_alloc
get_item_addr(uint var_idx);
bool
set_return_value(THD *thd, Item *return_value_item);
set_return_value(THD *thd, Item **return_value_item);
inline bool
is_return_value_set() const
@ -200,7 +200,7 @@ class sp_rcontext : public Sql_alloc
*/
int
set_case_expr(THD *thd, int case_expr_id, Item *case_expr_item);
set_case_expr(THD *thd, int case_expr_id, Item **case_expr_item_ptr);
Item *
get_case_expr(int case_expr_id);
@ -254,7 +254,7 @@ private:
Item_cache *create_case_expr_holder(THD *thd, Item_result result_type);
int set_variable(THD *thd, Field *field, Item *value);
int set_variable(THD *thd, Field *field, Item **value);
}; // class sp_rcontext : public Sql_alloc

2
sql/sql_class.cc
View file

@ -1877,7 +1877,7 @@ bool select_dumpvar::send_data(List<Item> &items)
if ((yy=var_li++))
{
if (thd->spcont->set_variable(current_thd, yy->get_var_idx(),
*it.ref()))
it.ref()))
DBUG_RETURN(1);
}
}