[mapserver-commits] [MapServer/MapServer] 6b4ac6: msSHXLoadPage(): fix integer overflow

[Even Rouault]

  Branch: refs/heads/backport-6690-to-branch-8-0
  Home:   https://github.com/MapServer/MapServer
  Commit: 6b4ac646c9bfbc4288275703b1a4693de7b6f469
      https://github.com/MapServer/MapServer/commit/6b4ac646c9bfbc4288275703b1a4693de7b6f469
  Author: Even Rouault <even.rouault at spatialys.com>
  Date:   2022-10-08 (Sat, 08 Oct 2022)

  Changed paths:
    M mapshape.c

  Log Message:
  -----------
  msSHXLoadPage(): fix integer overflow

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52211