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seq_search_localized() returns the length of the matching prefix in *len, but because it internally case-folds the inputs, it gets confused on the length. The caller expects to get the length of the prefix in the original string, but what it actually returns is the length of the prefix after case-folding, which can be different if the case-folded characters have different byte-length than the original, or with ICU, if the case-folding changes the number of characters (e.g. "ß", the German double s). To fix, once we have determined that we have a match, work harder to find the match's length in the original string. This adds some overhead, but the strings are expected to be short. The function does "case-folding" by converting a string to upper-case, then to lower-case, which is a little ugly given that we have dedicated functions for case-folding nowadays. But switching to that doesn't seem appropriate to backpatch in a security fix, and that's not available in older stable versions, anyway. Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> Reported-by: Xint Code Reviewed-by: Jeff Davis <pgsql@j-davis.com>
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.