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The code was intentionally not very careful about leaking strdup'd strings in case of an error. That was forgivable probably, but it also failed to notice strdup() failures, which could lead to subsequent null-pointer-dereference crashes, since many callers unsurprisingly didn't check for null pointers in the struct lconv fields. An even worse problem is that it could throw error while we were setlocale'd to a non-C locale, causing unwanted behavior in subsequent libc calls. Rewrite to ensure that we cannot throw elog(ERROR) until after we've restored the previous locale settings, or at least attempted to. (I'm sorely tempted to make restore failure be a FATAL error, but will refrain for the moment.) Having done that, it's not much more work to ensure that we clean up strdup'd storage on the way out, too. This code is substantially the same in all supported branches, so back-patch all the way. Michael Paquier and Tom Lane Discussion: <CAB7nPqRMbGqa_mesopcn4MPyTs34eqtVEK7ELYxvvV=oqS00YA@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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.