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MDEV-29748 ASAN errors or server crash in File_parser::parse upon concurrent view operations

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Read the version of the view share when we read definition to prevent
simultaniouse access to a view table SHARE (and so its MEM_ROOT)
from different threads.
This commit is contained in:
Oleksandr Byelkin 2022-10-12 15:59:46 +02:00
parent e00ea301ef
commit 4fd6dd2d3b
3 changed files with 16 additions and 14 deletions
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24
sql/sql_view.cc
View file

@ -1175,19 +1175,26 @@ err:
bool mariadb_view_version_get(TABLE_SHARE *share)
{
DBUG_ASSERT(share->is_view);
DBUG_ASSERT(share->tabledef_version.length == 0);
if (!(share->tabledef_version.str=
(uchar*) alloc_root(&share->mem_root,
MICROSECOND_TIMESTAMP_BUFFER_SIZE)))
return TRUE;
share->tabledef_version.length= 0; // safety if the drfinition file is brocken
DBUG_ASSERT(share->view_def != NULL);
if (share->view_def->parse((uchar *) &share->tabledef_version, NULL,
view_timestamp_parameters, 1,
&file_parser_dummy_hook))
{
// safety if the definition file is brocken
share->tabledef_version.length= 0;
my_error(ER_TABLE_CORRUPT, MYF(0),
share->db.str, share->table_name.str);
return TRUE;
}
DBUG_ASSERT(share->tabledef_version.length == MICROSECOND_TIMESTAMP_BUFFER_SIZE-1);
return FALSE;
}
@ -1251,10 +1258,7 @@ bool mysql_make_view(THD *thd, TABLE_SHARE *share, TABLE_LIST *table,
mysql_derived_reinit(thd, NULL, table);
DEBUG_SYNC(thd, "after_cached_view_opened");
if (!share->tabledef_version.length)
{
mariadb_view_version_get(share);
}
DBUG_ASSERT(share->tabledef_version.length);
DBUG_RETURN(0);
}
@ -1308,15 +1312,7 @@ bool mysql_make_view(THD *thd, TABLE_SHARE *share, TABLE_LIST *table,
required_view_parameters,
&file_parser_dummy_hook)))
goto end;
if (!share->tabledef_version.length)
{
share->tabledef_version.str= (const uchar *)
memdup_root(&share->mem_root,
(const void *)
table->hr_timestamp.str,
(share->tabledef_version.length=
table->hr_timestamp.length));
}
DBUG_ASSERT(share->tabledef_version.length);
if (!table->tabledef_version.length)
{
table->set_view_def_version(&table->hr_timestamp);

2
sql/sql_view.h
View file

@ -64,4 +64,6 @@ extern const LEX_CSTRING view_type;
void make_valid_column_names(List<Item> &item_list);
bool mariadb_view_version_get(TABLE_SHARE *share);
#endif /* SQL_VIEW_INCLUDED */

4
sql/table.cc
View file

@ -633,7 +633,11 @@ enum open_frm_error open_table_def(THD *thd, TABLE_SHARE *share, uint flags)
if (!share->view_def)
share->error= OPEN_FRM_ERROR_ALREADY_ISSUED;
else
{
share->error= OPEN_FRM_OK;
if (mariadb_view_version_get(share))
share->error= OPEN_FRM_ERROR_ALREADY_ISSUED;
}
}
else
share->error= OPEN_FRM_NOT_A_TABLE;