It's a simple array overrun in QtMir:
nextTopLeftPosition +=
output.modes[output.preferred_mode_index].size.width.as_int();
Looks like it's missing a check for the possibility of there being no
preferred mode:
output.preferred_mode_index >= modes.size()
Which is possible, an
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Changed in: unity8 (Ubuntu)
Status: New => Invalid
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Bugs, which
