[mapserver-commits] [MapServer/MapServer] 883714: msSHPOpenVirtualFile(): fix integer overflow

[Even Rouault]

  Branch: refs/heads/backport-6691-to-branch-8-0
  Home:   https://github.com/MapServer/MapServer
  Commit: 883714e12ed1ecaa0c0664bd77a5fcf76e9cfc3e
      https://github.com/MapServer/MapServer/commit/883714e12ed1ecaa0c0664bd77a5fcf76e9cfc3e
  Author: Even Rouault <even.rouault at spatialys.com>
  Date:   2022-10-08 (Sat, 08 Oct 2022)

  Changed paths:
    M mapshape.c

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

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52213