row0mysql.c:

  Fix memory corruption bug reported by Georg Richter: if one created a table whose primary key contained at least 2 column prefixes, that could corrupt the memory heap of prebuilt_t

innobase/row/row0mysql.c

@@ -424,10 +424,13 @@ row_create_prebuilt(
 	prebuilt->sel_graph = NULL;
 
 	prebuilt->search_tuple = dtuple_create(heap,
-						dict_table_get_n_cols(table));
+					2 * dict_table_get_n_cols(table));
 	
 	clust_index = dict_table_get_first_index(table);
 
+	/* Make sure that search_tuple is long enough for clustered index */
+	ut_a(2 * dict_table_get_n_cols(table) >= clust_index->n_fields);
+
 	ref_len = dict_index_get_n_unique(clust_index);
 
 	ref = dtuple_create(heap, ref_len);