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When result_is_int is set to 0, PQfn() cannot validate that the result fits in result_buf, so it will write data beyond the end of the buffer when the server returns more data than requested. Since this function is insecurable and obsolete, add a warning to the top of the pertinent documentation advising against its use. The only in-tree caller of PQfn() is the frontend large object interface. To fix that, add a buf_size parameter to pqFunctionCall3() that is used to protect against overruns, and use it in a private version of PQfn() that also accepts a buf_size parameter. Reported-by: Yu Kunpeng <yu443940816@live.com> Reported-by: Martin Heistermann <martin.heistermann@unibe.ch> Author: Nathan Bossart <nathandbossart@gmail.com> Reviewed-by: Noah Misch <noah@leadboat.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Etsuro Fujita <etsuro.fujita@gmail.com> Security: CVE-2026-6477 Backpatch-through: 14 |
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