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Base de données relationnelle
6b2e091f02
Functions such as hash_numeric() are not careful to use the correct PG_RETURN_*() macro according to the return type of that function as defined in pg_proc. Because that function is meant to return int32, when the hashed value exceeds 2^31, the 64-bit Datum value won't wrap to a negative number, which means the Datum won't have the same value as it would have had it been cast to int32 on a two's complement machine. This isn't harmless as both datum_image_eq() and datum_image_hash() may receive a Datum that's been formed and deformed from a tuple in some cases, and not in other cases. When formed into a tuple, the Datum value will be coerced into an integer according to the attlen as specified by the TupleDesc. This can result in two Datums that should be equal being classed as not equal, which could result in (but not limited to) an error such as: ERROR: could not find memoization table entry Here we fix this by ensuring we cast the Datum value to a signed integer according to the typLen specified in the datum_image_eq/datum_image_hash function call before comparing or hashing. Author: David Rowley <dgrowleyml@gmail.com> Reported-by: Tender Wang <tndrwang@gmail.com> Backpatch-through: 14 Discussion: https://postgr.es/m/CAHewXNmcXVFdB9_WwA8Ez0P+m_TQy_KzYk5Ri5dvg+fuwjD_yw@mail.gmail.com |
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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/.