{{tag>zxt:extension}}

====== 00000001:0002 - FIX: #bind double freeing ======

===== Information =====

  * **ID:** 00000001:0002

===== Flags =====

^ Flag ^ Set? (MUST/MAY/...) ^ Description ^
| parsing_must | MUST NOT | |
| reading_must | MUST NOT | |
| writing_must | MUST NOT | |
| playing_should | MAY | |
| playing_must | MAY | |
| editing_should | MUST NOT | |

===== Field data =====

None.

===== Description =====

This extension fixes double frees in the #BIND command. Its presence guarantees that #BINDing on an object which is already bound will not cause invalid memory freeing.

In ZZT 3.2's codebase, this involves two specific additional checks:

  * If the stat which is changing bindings's data pointer is used by another stat, it should not free that data pointer,
  * If the stat is binding to itself, it should not free that data pointer.

===== Implementations =====

  * [[https://github.com/OpenZoo/ClassicZoo/commit/35d5771e9cda17968dce75c70f591e5c79e14457|Patch to ZZT 3.2 (1/2)]]
  * [[https://github.com/OpenZoo/ClassicZoo/commit/35c0bd35d1f52714f1c520b559155210ab093db6|Patch to ZZT 3.2 (2/2)]]