[Bug 30198] HAL crashes from nested dbus callbacks.

[Scott Robinson]

Public bug reported:
https://launchpad.net/malone/bugs/30198

Affects: hal (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
A user can construct a script to crash HAL anytime it emits a device
addition or removal signal.

The script calls back to HAL requesting further information while it's
already in a signal.