Unallocated memory or corrupt memory access while drawing Passable areas

[tomsons26]

Operating System: Windows 7 SP1

Commit/build: None

Original game source: game disc

• Reproducible in the original Generals Zero Hour?
  Multiplayer affected?
  Are you using any mods? (like Gentool, Rise of the Reds or Contra)

Issue explanation

The game is either accessing memory it hasn't allocated or something is corrupting it resulting in this when the debug bool for drawing passable areas is enabled, most of the time enabling the bool seemingly cause of this bug causes the game to crash. On rare occasions it does work.

Screenshot(s) or video

Area in ZH

Same area in WB