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MDEV-15907 ASAN heap-use-after-free

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This patch fixes an invalid read in fill_effective_table_privileges
triggered by a grant_version increase between a PREPARE for a
statement creating a view from I_S and EXECUTE.
A tmp table was created and free'd while preparing the statement,
TABLE_LIST::table_name was set to point to the tmp table
TABLE_SHARE::table_name which no longer existed after preparing was
done.
The grant version increase made fill_effective_table_privileges
called during EXECUTE to try fetch the updated grant info and
this is where the dangling table name was used.
This commit is contained in:
Robert Bindar
2019-04-01 11:54:29 +03:00
committed by Sergei Golubchik
parent 5d510fdbf0
commit e52a4ab693
4 changed files with 10 additions and 3 deletions
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4
mysql-test/r/mdev15907.result Normal file
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@@ -0,0 +1,4 @@
PREPARE stmt2 FROM "CREATE VIEW v AS SELECT * FROM INFORMATION_SCHEMA.TABLES";
FLUSH PRIVILEGES;
EXECUTE stmt2;
DROP VIEW v;

4
mysql-test/t/mdev15907.test Normal file
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@@ -0,0 +1,4 @@
PREPARE stmt2 FROM "CREATE VIEW v AS SELECT * FROM INFORMATION_SCHEMA.TABLES";
FLUSH PRIVILEGES;
EXECUTE stmt2;
DROP VIEW v;

2
sql/sql_show.cc
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@@ -7620,8 +7620,6 @@ int mysql_schema_table(THD *thd, LEX *lex, TABLE_LIST *table_list)
table->alias_name_used= my_strcasecmp(table_alias_charset, table->alias_name_used= my_strcasecmp(table_alias_charset,
table_list->schema_table_name, table_list->schema_table_name,
table_list->alias); table_list->alias);
table_list->table_name= table->s->table_name.str;
table_list->table_name_length= table->s->table_name.length;
table_list->table= table; table_list->table= table;
table->next= thd->derived_tables; table->next= thd->derived_tables;
thd->derived_tables= table; thd->derived_tables= table;

3
sql/table.cc
View File

@@ -5373,7 +5373,8 @@ const char *Field_iterator_table_ref::get_table_name()
return natural_join_it.column_ref()->table_name(); return natural_join_it.column_ref()->table_name();
DBUG_ASSERT(!strcmp(table_ref->table_name, DBUG_ASSERT(!strcmp(table_ref->table_name,
table_ref->table->s->table_name.str)); table_ref->table->s->table_name.str) ||
table_ref->schema_table);
return table_ref->table_name; return table_ref->table_name;
} }