Lua Error: error calling PPPP heuristic dissector: Range is out of bounds

[GrumpyMeow]

Hi!
The dissector works remarkably well! Nicely done!

The first set of MSG_DRW messages of my camera causes this error:
Lua Error: error calling PPPP heuristic dissector: /home/.../.local/lib/wireshark/plugins/pppp_dissect.lua:199: Range is out of bounds

any idea?

[magicus]

The code in question looks like this:

function dissect_opcode_drw_command(buffer, pinfo, subtree, roottree)
  local commands_channel_subtree = roottree:add(buffer(), "PPPP Command Channel")

  while buffer:len() > 0 do
    local command_block_length = buffer(4, 4):le_uint()
    local command_subtree = commands_channel_subtree:add(buffer(0, 8 + command_block_length), "Command Block")
...

so it seems that the DRW packet does not have a reasonable command block length as expected. I don't really know what to make of this.