All user-controlled values interpolated into SQL WHERE clause fragments
in transTreeItem() and getSysVariableValue() are now passed through
_escape_sql_value() which doubles single quotes (standard SQL escaping)
and escapes backslashes. The logic operator in transTreeToWhere() is
also validated against a whitelist.
Affected injection vectors:
- item["enum_value"] list (enum filter)
- item["value"] string (normal filter)
- user variable values (variable filter)
- current_user name/account/email (system variable filter)
- tree["logic"] operator (tree structure)
junjun