sql_table.cc, table.cc, table.h:

  fixed CHECKSUM TABLE to be independent from last - undefined in InnoDB - bits in the null bitmask
  bug#13710


sql/table.h:
  fixed CHECKSUM TABLE to be independent from last - undefined in InnoDB - bits in the null bitmask
  bug#13710
sql/table.cc:
  fixed CHECKSUM TABLE to be independent from last - undefined in InnoDB - bits in the null bitmask
  bug#13710
sql/sql_table.cc:
  fixed CHECKSUM TABLE to be independent from last - undefined in InnoDB - bits in the null bitmask
  bug#13710

sql/sql_table.cc

@@ -4100,6 +4100,7 @@ bool mysql_checksum_table(THD *thd, TABLE_LIST *tables, HA_CHECK_OPT *check_opt)
       {
 	/* calculating table's checksum */
 	ha_checksum crc= 0;
+        uchar null_mask=256 -  (1 << t->s->last_null_bit_pos);
 
 	/* InnoDB must be told explicitly to retrieve all columns, because
 	this function does not set field->query_id in the columns to the
@@ -4120,9 +4121,12 @@ bool mysql_checksum_table(THD *thd, TABLE_LIST *tables, HA_CHECK_OPT *check_opt)
                 continue;
               break;
             }
-	    if (t->record[0] != (byte*) t->field[0]->ptr)
-	      row_crc= my_checksum(row_crc, t->record[0],
-				   ((byte*) t->field[0]->ptr) - t->record[0]);
+	    if (t->s->null_bytes)
+            {
+              /* fix undefined null bits */
+              t->record[0][t->s->null_bytes-1] |= null_mask;
+	      row_crc= my_checksum(row_crc, t->record[0], t->s->null_bytes);
+            }
 
 	    for (uint i= 0; i < t->s->fields; i++ )
 	    {

sql/table.cc

@@ -874,6 +874,7 @@ int openfrm(THD *thd, const char *name, const char *alias, uint db_stat,
 
   /* the correct null_bytes can now be set, since bitfields have been taken into account */
   share->null_bytes= null_pos - (uchar*) outparam->null_flags + (null_bit_pos + 7) / 8;
+  share->last_null_bit_pos= null_bit_pos;
 
   /* The table struct is now initialized;  Open the table */
   error=2;

sql/table.h

@@ -141,7 +141,7 @@ typedef struct st_table_share
   enum tmp_table_type tmp_table;
 
   uint blob_ptr_size;			/* 4 or 8 */
-  uint null_bytes;
+  uint null_bytes, last_null_bit_pos;
   uint key_length;			/* Length of table_cache_key */
   uint fields;				/* Number of fields */
   uint rec_buff_length;                 /* Size of table->record[] buffer */