Bug#26390632: CREATE TABLE CAN CAUSE MYSQL TO EXIT.

Analysis
========
CREATE TABLE of InnoDB table with a partition name
which exceeds the path limit can cause the server
to exit.

During the preparation of the partition name,
there was no check to identify whether the complete
path name for partition exceeds the max supported
path length, causing the server to exit during
subsequent processing.

Fix
===
During the preparation of partition name, check and report
an error if the partition path name exceeds the maximum path
name limit.

This is a 5.5 patch.

sql/sql_partition.h

 #ifndef SQL_PARTITION_INCLUDED
 #define SQL_PARTITION_INCLUDED
 
-/* Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2006, 2017, Oracle and/or its affiliates. All rights reserved.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -272,10 +272,10 @@ char *generate_partition_syntax(partition_info *part_info,
                                 const char *current_comment_start);
 #endif
 
-void create_partition_name(char *out, const char *in1,
+bool create_partition_name(char *out, const char *in1,
                            const char *in2, uint name_variant,
                            bool translate);
-void create_subpartition_name(char *out, const char *in1,
+bool create_subpartition_name(char *out, const char *in1,
                               const char *in2, const char *in3,
                               uint name_variant);