Cherrypick into XtraDB: Bug#13002783 PARTIALLY UNINITIALIZED CASCADE UPDATE VECTOR

We merged the test case for this into MariaDB 5.1, but the fix
was not yet part of XtraDB.

storage/xtradb/ChangeLog

+2011-10-25	The InnoDB Team
+
+	* handler/ha_innodb.cc, row/row0ins.c:
+	Fix Bug#13002783 PARTIALLY UNINITIALIZED CASCADE UPDATE VECTOR
+
 2011-08-08	The InnoDB Team
 
 	* row/row0sel.c:

storage/xtradb/handler/ha_innodb.cc

@@ -5360,14 +5360,15 @@ calc_row_difference(
 			/* The field has changed */
 
 			ufield = uvect->fields + n_changed;
+			UNIV_MEM_INVALID(ufield, sizeof *ufield);
 
 			/* Let us use a dummy dfield to make the conversion
 			from the MySQL column format to the InnoDB format */
 
+			if (n_len != UNIV_SQL_NULL) {
 				dict_col_copy_type(prebuilt->table->cols + i,
 						   dfield_get_type(&dfield));
 
-			if (n_len != UNIV_SQL_NULL) {
 				buf = row_mysql_store_col_in_innobase_format(
 					&dfield,
 					(byte*)buf,
@@ -5375,7 +5376,7 @@ calc_row_difference(
 					new_mysql_row_col,
 					col_pack_len,
 					dict_table_is_comp(prebuilt->table));
-				dfield_copy_data(&ufield->new_val, &dfield);
+				dfield_copy(&ufield->new_val, &dfield);
 			} else {
 				dfield_set_null(&ufield->new_val);
 			}

storage/xtradb/row/row0ins.c

@@ -434,11 +434,9 @@ row_ins_cascade_calc_update_vec(
 	dict_table_t*	table		= foreign->foreign_table;
 	dict_index_t*	index		= foreign->foreign_index;
 	upd_t*		update;
-	upd_field_t*	ufield;
 	dict_table_t*	parent_table;
 	dict_index_t*	parent_index;
 	upd_t*		parent_update;
-	upd_field_t*	parent_ufield;
 	ulint		n_fields_updated;
 	ulint		parent_field_no;
 	ulint		i;
@@ -474,13 +472,15 @@ row_ins_cascade_calc_update_vec(
 			dict_index_get_nth_col_no(parent_index, i));
 
 		for (j = 0; j < parent_update->n_fields; j++) {
-			parent_ufield = parent_update->fields + j;
+			const upd_field_t*	parent_ufield
+				= &parent_update->fields[j];
 
 			if (parent_ufield->field_no == parent_field_no) {
 
 				ulint			min_size;
 				const dict_col_t*	col;
 				ulint			ufield_len;
+				upd_field_t*		ufield;
 
 				col = dict_index_get_nth_col(index, i);
 
@@ -493,6 +493,8 @@ row_ins_cascade_calc_update_vec(
 				ufield->field_no
 					= dict_table_get_nth_col_pos(
 					table, dict_col_get_no(col));
+
+				ufield->orig_len = 0;
 				ufield->exp = NULL;
 
 				ufield->new_val = parent_ufield->new_val;
@@ -993,10 +995,9 @@ row_ins_foreign_check_on_constraint(
 		goto nonstandard_exit_func;
 	}
 
-	if ((node->is_delete
-	     && (foreign->type & DICT_FOREIGN_ON_DELETE_SET_NULL))
-	    || (!node->is_delete
-		&& (foreign->type & DICT_FOREIGN_ON_UPDATE_SET_NULL))) {
+	if (node->is_delete
+	    ? (foreign->type & DICT_FOREIGN_ON_DELETE_SET_NULL)
+	    : (foreign->type & DICT_FOREIGN_ON_UPDATE_SET_NULL)) {
 
 		/* Build the appropriate update vector which sets
 		foreign->n_fields first fields in rec to SQL NULL */
@@ -1005,6 +1006,8 @@ row_ins_foreign_check_on_constraint(
 
 		update->info_bits = 0;
 		update->n_fields = foreign->n_fields;
+		UNIV_MEM_INVALID(update->fields,
+				 update->n_fields * sizeof *update->fields);
 
 		for (i = 0; i < foreign->n_fields; i++) {
 			upd_field_t*	ufield = &update->fields[i];