[mapserver-commits] [MapServer/MapServer] db47dc: mapobject.c: clear cached reprojectors in msRemove...

[Kaixuan Li]

  Branch: refs/heads/backport-7612-to-branch-8-6
  Home:   https://github.com/MapServer/MapServer
  Commit: db47dc3ef59128fe418be5f05be105fe66bbad4b
      https://github.com/MapServer/MapServer/commit/db47dc3ef59128fe418be5f05be105fe66bbad4b
  Author: MarkLee131 <kaixuan.li at ntu.edu.sg>
  Date:   2026-08-27 (Thu, 27 Aug 2026)

  Changed paths:
    M msautotest/mspython/test_bug_check.py
    M src/mapobject.c

  Log Message:
  -----------
  mapobject.c: clear cached reprojectors in msRemoveLayer() (fixes #7611)

msRemoveLayer() detached a layer without clearing
layer->reprojectorLayerToMap / reprojectorMapToLayer. Those cached
reprojectors hold a raw pointer to the map the layer was removed from,
which has two consequences:

- A layer moved to another map keeps reprojecting to the old map's
  projection, so it is drawn in the wrong place or not at all.
- If the old map is freed while the layer lives on, the next
  msLayerGetReprojectorToMap() reads reprojector->out->generation_number
  from freed memory.

freeLayer() already destroys both cached reprojectors and initLayer()
initialises them to NULL, so this brings msRemoveLayer() in line with the
other two.

Adds a msautotest case that moves a layer between two maps with different
projections and checks that it still renders in the new one.



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