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The new DBus API helper function wpas_dbus_error_unknown_error function can be called as a result of a failure within internal getter calls, which will call this function with a NULL message parameter. However, dbus_message_new_error looks very unkindly (i.e, abort()) on a NULL message, so in this case, we should not call it. I've observed this course of events during a call to wpas_dbus_getter_bss_wpa with a faileld parse of the IE parameter. We got here through a call to fill_dict_with_properties which explicitly calls getters with a NULL message parameter. Judging from the way it is called, this could easily occur if an AP sends out a malformed (or mis-received) probe response. I usually run into this problem while driving through San Francisco, so I'm exposed to any number of base stations along this path.
wpa_supplicant and hostapd v0.6.x --------------------------------- Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi> and contributors All Rights Reserved. These program is dual-licensed under both the GPL version 2 and BSD license. Either license may be used at your option. This package may include either wpa_supplicant, hostapd, or both. See README file respective subdirectories (wpa_supplicant/README or hostapd/README) for more details. Source code files have been moved around in v0.6.x releases and compared to earlier releases, the programs are now build by first going to a subdirectory (wpa_supplicant or hostapd) and creating build configuration (.config) and running 'make' there (for Linux/BSD/cygwin builds).