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Commit 227e8e4e authored by unknown's avatar unknown
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BUG#24533 (uninitialized null but of m_after_image): 

Patch to fix valgrind warning that uninitialized bytes were written. 
The warning was caused by set_default(), which assumes that the field pointer is pointing
into record[0], while all other functions honors the move_field_offset().


sql/log_event.cc:
  Changing unpack_row() to always unpack into table->record[0] since the Field class hierarchy
  contain too many dependencies on the record to operate on being in table->record[0].
  Changing code to use the new unpack_row(), which requires some juggling of records in
  one case.
parent 5cffd57e
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Showing with 36 additions and 29 deletions
sql/log_event.cc
View file @ 227e8e4e
......@@ -5467,14 +5467,13 @@ int Rows_log_event::do_add_row_data(byte *const row_data,
#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
/*
Unpack a row into a record.
Unpack a row into table->record[0].
SYNOPSIS
unpack_row()
rli Relay log info
table Table to unpack into
colcnt Number of columns to read from record
record Record where the data should be unpacked
row Packed row data
cols Pointer to columns data to fill in
row_end Pointer to variable that will hold the value of the
......@@ -5487,6 +5486,11 @@ int Rows_log_event::do_add_row_data(byte *const row_data,
DESCRIPTION
The function will always unpack into the table->record[0]
record. This is because there are too many dependencies on
where the various member functions of Field and subclasses
expect to write.
The row is assumed to only consist of the fields for which the
bitset represented by 'arr' and 'bits'; the other parts of the
record are left alone.
......@@ -5505,15 +5509,15 @@ int Rows_log_event::do_add_row_data(byte *const row_data,
*/
static int
unpack_row(RELAY_LOG_INFO *rli,
TABLE *table, uint const colcnt, byte *record,
TABLE *table, uint const colcnt,
char const *row, MY_BITMAP const *cols,
char const **row_end, ulong *master_reclength,
MY_BITMAP* const rw_set, Log_event_type const event_type)
{
byte *const record= table->record[0];
DBUG_ENTER("unpack_row");
DBUG_ASSERT(record && row);
DBUG_PRINT("enter", ("row=0x%lx; record=0x%lx", row, record));
my_ptrdiff_t const offset= record - (byte*) table->record[0];
DBUG_PRINT("enter", ("row=0x%lx; table->record[0]=0x%lx", row, record));
my_size_t master_null_bytes= table->s->null_bytes;
if (colcnt != table->s->fields)
......@@ -5555,11 +5559,9 @@ unpack_row(RELAY_LOG_INFO *rli,
{
DBUG_ASSERT(table->record[0] <= f->ptr);
DBUG_ASSERT(f->ptr < table->record[0] + table->s->reclength + (f->pack_length_in_rec() == 0));
f->move_field_offset(offset);
DBUG_PRINT("info", ("unpacking column '%s' to 0x%lx", f->field_name, f->ptr));
ptr= f->unpack(f->ptr, ptr);
f->move_field_offset(-offset);
/* Field...::unpack() cannot return 0 */
DBUG_ASSERT(ptr != NULL);
}
......@@ -5590,9 +5592,10 @@ unpack_row(RELAY_LOG_INFO *rli,
for ( ; *field_ptr ; ++field_ptr)
{
uint32 const mask= NOT_NULL_FLAG | NO_DEFAULT_VALUE_FLAG;
Field *const f= *field_ptr;
if (event_type == WRITE_ROWS_EVENT &&
((*field_ptr)->flags & mask) == mask)
DBUG_PRINT("info", ("processing column '%s' @ 0x%lx", f->field_name, f->ptr));
if (event_type == WRITE_ROWS_EVENT && (f->flags & mask) == mask)
{
slave_print_msg(ERROR_LEVEL, rli, ER_NO_DEFAULT_FOR_FIELD,
"Field `%s` of table `%s`.`%s` "
......@@ -5602,7 +5605,7 @@ unpack_row(RELAY_LOG_INFO *rli,
error = ER_NO_DEFAULT_FOR_FIELD;
}
else
(*field_ptr)->set_default();
f->set_default();
}
DBUG_RETURN(error);
......@@ -6458,10 +6461,8 @@ int Write_rows_log_event::do_prepare_row(THD *thd, RELAY_LOG_INFO *rli,
DBUG_ASSERT(row_start && row_end);
int error;
error= unpack_row(rli,
table, m_width, table->record[0],
row_start, &m_cols, row_end, &m_master_reclength,
table->write_set, WRITE_ROWS_EVENT);
error= unpack_row(rli, table, m_width, row_start, &m_cols, row_end,
&m_master_reclength, table->write_set, WRITE_ROWS_EVENT);
bitmap_copy(table->read_set, table->write_set);
return error;
}
......@@ -7063,10 +7064,8 @@ int Delete_rows_log_event::do_prepare_row(THD *thd, RELAY_LOG_INFO *rli,
*/
DBUG_ASSERT(table->s->fields >= m_width);
error= unpack_row(rli,
table, m_width, table->record[0],
row_start, &m_cols, row_end, &m_master_reclength,
table->read_set, DELETE_ROWS_EVENT);
error= unpack_row(rli, table, m_width, row_start, &m_cols, row_end,
&m_master_reclength, table->read_set, DELETE_ROWS_EVENT);
/*
If we will access rows using the random access method, m_key will
be set to NULL, so we do not need to make a key copy in that case.
......@@ -7200,25 +7199,30 @@ int Update_rows_log_event::do_prepare_row(THD *thd, RELAY_LOG_INFO *rli,
*/
DBUG_ASSERT(table->s->fields >= m_width);
/*
We need to perform some juggling below since unpack_row() always
unpacks into table->record[0]. For more information, see the
comments for unpack_row().
*/
/* record[0] is the before image for the update */
error= unpack_row(rli,
table, m_width, table->record[0],
row_start, &m_cols, row_end, &m_master_reclength,
table->read_set, UPDATE_ROWS_EVENT);
error= unpack_row(rli, table, m_width, row_start, &m_cols, row_end,
&m_master_reclength, table->read_set, UPDATE_ROWS_EVENT);
store_record(table, record[1]);
char const *next_start = *row_end;
/* m_after_image is the after image for the update */
error= unpack_row(rli,
table, m_width, m_after_image,
next_start, &m_cols, row_end, &m_master_reclength,
table->write_set, UPDATE_ROWS_EVENT);
error= unpack_row(rli, table, m_width, next_start, &m_cols, row_end,
&m_master_reclength, table->write_set, UPDATE_ROWS_EVENT);
bmove_align(m_after_image, table->record[0], table->s->reclength);
restore_record(table, record[1]);
/*
Don't print debug messages when running valgrind since they can
trigger false warnings.
*/
#ifndef HAVE_purify
DBUG_DUMP("record[0]", (const char *)table->record[0], m_master_reclength);
DBUG_DUMP("m_after_image", (const char *)m_after_image, m_master_reclength);
DBUG_DUMP("record[0]", (const char *)table->record[0], table->s->reclength);
DBUG_DUMP("m_after_image", (const char *)m_after_image, table->s->reclength);
#endif
/*
......@@ -7259,6 +7263,9 @@ int Update_rows_log_event::do_exec_row(TABLE *table)
bmove_align(table->record[0], m_after_image, table->s->reclength);
copy_extra_record_fields(table, m_master_reclength, m_width);
valgrind_check_mem(table->record[0], table->s->reclength);
valgrind_check_mem(table->record[1], table->s->reclength);
/*
Now we have the right row to update. The old row (the one we're
looking for) is in record[1] and the new row has is in record[0].
......
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