6220bc91c0
MemorySanitizer report:
==851408==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 ha_federated::end_bulk_insert() storage/federated/ha_federated.cc:2035:30
#1 mysql_insert(THD*, ...) sql/sql_insert.cc:1258:11
...
Memory was marked as uninitialized
#0 __msan_allocated_memory
#1 my_malloc mysys/my_malloc.c:116:7
SUMMARY: MemorySanitizer: use-of-uninitialized-value ... end_bulk_insert()
table_will_be_deleted is a handler member with no in-class
initializer, and the handler object itself is heap-allocated via
my_malloc(), so it starts out as garbage. It was only ever set in
extra(HA_EXTRA_PREPARE_FOR_DROP) and in external_lock(). For a
TEMPORARY table, statement execution can reach end_bulk_insert(),
which reads the flag, without external_lock() having run first, so the
read sees uninitialized memory.
The fix initializes table_will_be_deleted in reset(). Both
ha_federated::open() and ha_federatedx::open() call reset(), so the
flag is initialized on first open and cleared after every statement.
That also covers the first statement after open (e.g. CREATE TEMPORARY
TABLE ... ENGINE=FEDERATED ... SELECT, where external_lock() is not
called).
Code status:
ci.appveyor.com
MariaDB: The innovative open source database
MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
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