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MDEV-31995 Fix2 allocate memory in mem_root properly.

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Lex_ident_sys had no new operator and was used incorrectly in
save_item_list_names(), so leaked memory.
This commit is contained in:
Rex 2023-11-17 13:33:07 +12:00 committed by Daniel Black
parent 36680b648a
commit 2c1345ab27
2 changed files with 12 additions and 2 deletions
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5
sql/sql_lex.cc
View File

@ -10697,8 +10697,9 @@ bool st_select_lex::save_item_list_names(THD *thd)
while ((item= li++))
{
if (unlikely(orig_names_of_item_list_elems->push_back(
new Lex_ident_sys(item->name.str, item->name.length), thd->mem_root)))
Lex_ident_sys *name= new (thd->mem_root) Lex_ident_sys(thd, &item->name);
if (unlikely(!name ||
orig_names_of_item_list_elems->push_back(name, thd->mem_root)))
{
if (arena)
thd->restore_active_arena(arena, &backup);

9
sql/sql_lex.h
View File

@ -143,6 +143,11 @@ public:
struct Lex_ident_sys_st: public LEX_CSTRING
{
public:
static void *operator new(size_t size, MEM_ROOT *mem_root) throw ()
{ return alloc_root(mem_root, size); }
static void operator delete(void *ptr,size_t size) { TRASH_FREE(ptr, size); }
static void operator delete(void *ptr, MEM_ROOT *mem_root) {}
bool copy_ident_cli(THD *thd, const Lex_ident_cli_st *str);
bool copy_keyword(THD *thd, const Lex_ident_cli_st *str);
bool copy_sys(THD *thd, const LEX_CSTRING *str);
@ -176,6 +181,10 @@ public:
LEX_CSTRING tmp= {name, length};
set_valid_utf8(&tmp);
}
Lex_ident_sys(THD *thd, const LEX_CSTRING *str)
{
set_valid_utf8(str);
}
Lex_ident_sys & operator=(const Lex_ident_sys_st &name)
{
Lex_ident_sys_st::operator=(name);