[Firebird-checkins] [FirebirdSQL/firebird] cdd120: Fix #8799: BUGCHECK "decompression overran buffer ...

[Ilya E. <no...@gi...>]

  Branch: refs/heads/v4.0-release
  Home:   https://github.com/FirebirdSQL/firebird
  Commit: cdd1207071fddb9c2969e2049f3aa2830b959c2a
      https://github.com/FirebirdSQL/firebird/commit/cdd1207071fddb9c2969e2049f3aa2830b959c2a
  Author: Ilya Eremin <ily...@gm...>
  Date:   2025-11-17 (Mon, 17 Nov 2025)

  Changed paths:
    M src/jrd/vio.cpp

  Log Message:
  -----------
  Fix #8799: BUGCHECK "decompression overran buffer (179)" when WITH LOCK clause is used (#8803)

VIO_writelock creates new_rpb by copying from org_rpb which has rpb_delta flag set. new_rpb is passed to prepare_update. It creates a delta but its size exceeds the limit (1024) so the current version is stored as a regular record. The problem is that rpb_delta flag remains set for new_rpb, and then replace_record sets it in the header of the primary version. From this moment any attempt to get data of older versions fails.



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