[CBRD-25229] Check the maximum length of the name in sm_check_system_…

…class_by_name (#4953)

http://jira.cubrid.org/browse/CBRD-25229

If the length of the table name exceeds 222 bytes, a segmentation fault occurs in sm_check_system_class_by_name. To prevent this, there are the following changes:

1. Check the maximum length of the name in sm_check_system_class_by_name.

In CBRD-24929, sm_check_system_class_by_name was refactored to no longer be an issue.

src/object/schema_manager.c

@@ -3446,7 +3446,7 @@ sm_check_system_class_by_name (const char *name)
   static int count = sizeof (system_classes) / sizeof (system_classes[0]);
 
   SYSTEM_CLASS_DEF sa;
-  char downcase_name[SM_MAX_IDENTIFIER_LENGTH - SM_MAX_USER_LENGTH] = { '\0' };
+  char downcase_name[SM_MAX_IDENTIFIER_LENGTH] = { '\0' };
   int len = 0;
   int cmp = 0;
   int i = 0;
@@ -3468,6 +3468,11 @@ sm_check_system_class_by_name (const char *name)
       return false;
     }
 
+  if (strlen (name) >= SM_MAX_IDENTIFIER_LENGTH - SM_MAX_USER_LENGTH)
+    {
+      return false;
+    }
+
   sm_downcase_name (name, downcase_name, SM_MAX_IDENTIFIER_LENGTH - SM_MAX_USER_LENGTH);
   sa.name = downcase_name;
   sa.len = strlen (downcase_name);