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When converting multibyte to pg_wchar, the UTF-8 implementation would silently ignore an incomplete final character, while the other implementations would cast a single byte to pg_wchar, and then repeat for the remaining byte sequence. While it didn't overrun the buffer, it was surely garbage output. Make all encodings behave like the UTF-8 implementation. A later change for master only will convert this to an error, but we choose not to back-patch that behavior change on the off-chance that someone is relying on the existing UTF-8 behavior. Security: CVE-2026-2006 Backpatch-through: 14 Author: Thomas Munro <thomas.munro@gmail.com> Reported-by: Noah Misch <noah@leadboat.com> Reviewed-by: Noah Misch <noah@leadboat.com> Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> |
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