[mapserver-commits] [MapServer/MapServer] 76345c: mapproject.c: check msProjectCreateReprojector() r...

[Kaixuan Li]

  Branch: refs/heads/backport-7615-to-branch-8-6
  Home:   https://github.com/MapServer/MapServer
  Commit: 76345c46ca36afe5953d8a5857475020262c87dc
      https://github.com/MapServer/MapServer/commit/76345c46ca36afe5953d8a5857475020262c87dc
  Author: MarkLee131 <kaixuan.li at ntu.edu.sg>
  Date:   2026-08-28 (Fri, 28 Aug 2026)

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

  Log Message:
  -----------
  mapproject.c: check msProjectCreateReprojector() result in msProjectRect() (fixes #7613)

The "polar stereographic to another projected system" branch passed the
result of msProjectCreateReprojector() straight to msProjectRectAsPolygon(),
which dereferences reprojector->out on its first line. When a transformation
cannot be built the reprojector is NULL and the process segfaults.

The six other calls to msProjectCreateReprojector() in this file all check
the result; this one was the exception.

The same block also leaked the reprojector when neither rect condition
matched, since it is created inside the for (sign ...) loop but destroyed
only on the two return paths. Destroy it before the next iteration.

Adds a msautotest case that reprojects a rectangle enclosing the pole to a
target no transformation can be built for.



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