Merged revision(s) 20641 from trunk/OpenMPT:

[Mod] MO3: Further reduce maximum allowed music data (not samples) size from 2GB to 512MB.
........


git-svn-id: https://source.openmpt.org/svn/openmpt/branches/OpenMPT-1.30@20643 56274372-70c3-4bfc-bfc3-4c3a0b034d27

soundlib/Load_mo3.cpp

@@ -740,7 +740,9 @@ static bool ValidateHeader(const MO3ContainerHeader &containerHeader)
  {
  return false;
  }
- if(containerHeader.musicSize <= sizeof(MO3FileHeader) || containerHeader.musicSize >= uint32_max / 2u)
+ // Due to the LZ algorithm's unbounded back window, we could reach gigantic sizes with just a few dozen bytes.
+ // 512 MB of music data (not samples) is chosen as a safeguard that is probably (hopefully) *way* beyond anything a real-world module will ever reach.
+ if(containerHeader.musicSize <= sizeof(MO3FileHeader) || containerHeader.musicSize >= 0x2000'0000)
  {
  return false;
  }