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The backend doesn't impose any particular limit on the length of this array, and since there could be entries for both input and output arguments, it's feasible for the length to exceed FUNC_MAX_ARGS even without funny business. This could lead to crashes or worse. Moreover, pg_dump shouldn't rely on hard-coding FUNC_MAX_ARGS in the first place: it has no business assuming that the backend it's dumping from was compiled with the same value of FUNC_MAX_ARGS that it is. So the stanza in dumpFunc() that allocates exactly FUNC_MAX_ARGS space for the parsed OID array is fundamentally misguided. And it's broken in another way too: if there are exactly FUNC_MAX_ARGS OIDs, then parseOidArray won't zero-fill any entries, allowing the subsequent loop to run off the end of the array. A crash seems unlikely in this variant, but garbage output is certain. To fix, redesign parseOidArray's API so that it does the array-mallocing, which simplifies the callers anyway. While we're here, tighten and modernize it a bit; in particular, split it into separate functions for OIDs and integers, as was foreseen long ago. This lets us get rid of the confusing type-punning involved in having IndxInfo.indkeys be declared as "Oid *" when it's really potentially-signed ints. Also, most of the callers expect an exact number of array entries, so make it verify that not just check for "too many". I noted while testing that this dumpFunc() stanza isn't even reached during check-world. Add a function with transform to the regression tests to rectify that. Reported-by: Masahiko Sawada <sawada.mshk@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Backpatch-through: 14 Security: CVE-2026-19385
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/.