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On 2015-11-19T09:58:28+00:00 Anders Kaseorg wrote:

I'm seeing the following crash in connect_bss_signals from GeoClue 2.4.0
built from Git master on Ubuntu 16.04.  It happens immediately upon
starting where-am-i (or, as far as I can tell, any other application
that requests a location).  The function checks whether bss_list[i] is
NULL but never checks whether bss_list itself is NULL.

Program received signal SIGSEGV, Segmentation fault.
0x00000000004176e6 in connect_bss_signals (wifi=0x7fffe40115e0 [GClueWifi])
    at gclue-wifi.c:395
395             for (i = 0; bss_list[i] != NULL; i++)
(gdb) bt full
#0  0x00000000004176e6 in connect_bss_signals (wifi=0x7fffe40115e0 [GClueWifi])
    at gclue-wifi.c:395
        priv = 0x7fffe4011540
        bss_list = 0x0
        i = 0
#1  0x0000000000418501 in gclue_wifi_start (source=0x7fffe40115e0 [GClueWifi])
    at gclue-wifi.c:435
        base_class = <optimized out>
        __func__ = "gclue_wifi_start"
#2  0x0000000000415876 in gclue_location_source_start 
(source=source@entry=0x7fffe40115e0 [GClueWifi]) at gclue-location-source.c:309
        __func__ = "gclue_location_source_start"
#3  0x0000000000416117 in start_source (locator=locator@entry=0x6803f0 
[GClueLocator], src=src@entry=0x7fffe40115e0 [GClueWifi]) at gclue-locator.c:188
        location = 0x0
#4  0x0000000000416a46 in gclue_locator_start (source=<optimized out>)
    at gclue-locator.c:407
        src = 0x7fffe40115e0 [GClueWifi]
        level = GCLUE_ACCURACY_LEVEL_STREET
        base_class = <optimized out>
        locator = 0x6803f0 [GClueLocator]
Python Exception <class 'TypeError'> iter() returned non-iterator of type 
'_iterator': 
        node = 0x697840
        __func__ = "gclue_locator_start"
#5  0x0000000000415876 in gclue_location_source_start (source=0x6803f0 
[GClueLocator])
    at gclue-location-source.c:309
        __func__ = "gclue_location_source_start"
#6  0x000000000040a5e5 in start_client (client=0x69f900 [GClueServiceClient], 
accuracy_level=accuracy_level@entry=GCLUE_ACCURACY_LEVEL_EXACT) at 
gclue-service-client.c:219
        priv = 0x69f850
#7  0x000000000040a7b8 in complete_start (data=data@entry=0x68ab50, 
accuracy_level=GCLUE_ACCURACY_LEVEL_EXACT) at gclue-service-client.c:301
        gdbus_client = 0x69f900
#8  0x000000000040a8dd in on_authorize_app_ready (source_object=0x66fbf0 
[GClueAgentProxy], res=0x667110, user_data=0x68ab50) at 
gclue-service-client.c:350
        data = 0x68ab50
        client = 0x69f900
        priv = 0x69f850
        error = 0x0
        authorized = 1
        accuracy_level = GCLUE_ACCURACY_LEVEL_EXACT
#9  0x00007ffff6d0fed3 in g_task_return_now (task=0x667110 [GTask])
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gtask.c:1106
#10 0x00007ffff6d1057e in g_task_return (task=0x667110 [GTask], type=<optimized 
out>)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gtask.c:1164
        source = 0x7fffe0008480
#11 0x00007ffff6d6875b in reply_cb (connection=<optimized out>, res=<optimized 
out>, user_data=0x667110) at 
/build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gdbusproxy.c:2579
        data = <optimized out>
        task = 0x667110 [GTask]
        value = <optimized out>
        error = 0x0
        fd_list = 0x0
#12 0x00007ffff6d0fed3 in g_task_return_now (task=0x7fffe40113a0 [GTask])
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gtask.c:1106
#13 0x00007ffff6d1057e in g_task_return (task=0x7fffe40113a0 [GTask], 
type=<optimized out>) at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gtask.c:1164
        source = 0x7fffe0008480
#14 0x00007ffff6d5d28a in g_dbus_connection_call_done (source=<optimized out>, 
result=0x687820, user_data=0x7fffe40113a0)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gdbusconnection.c:5704
        connection = <optimized out>
        task = 0x7fffe40113a0 [GTask]
        state = 0x697c40
        error = 0x0
        reply = 0x69cb20 [GDBusMessage]
        value = <optimized out>
#15 0x00007ffff6d0fed3 in g_task_return_now (task=0x687820 [GTask])
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gtask.c:1106
#16 0x00007ffff6d0ff09 in complete_in_idle_cb (task=0x687820)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./gio/gtask.c:1120
#17 0x00007ffff676efca in g_main_context_dispatch (context=0x663a00)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./glib/gmain.c:3154
        dispatch = 0x7ffff676ba80 <g_idle_dispatch>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x687820
        callback = 0x7ffff6d0ff00 <complete_in_idle_cb>
        cb_funcs = <optimized out>
        cb_data = 0x7fffe0007930
        need_destroy = <optimized out>
        source = 0x7fffe0008480
        current = 0x65c470
        i = 0
#18 0x00007ffff676efca in g_main_context_dispatch 
(context=context@entry=0x663a00)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./glib/gmain.c:3769
#19 0x00007ffff676f370 in g_main_context_iterate (context=0x663a00, 
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./glib/gmain.c:3840
        max_priority = 2147483647
        timeout = 25000
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 3
        fds = 0x66b820
#20 0x00007ffff676f692 in g_main_loop_run (loop=0x66b840)
    at /build/glib2.0-ZjeN9o/glib2.0-2.47.1/./glib/gmain.c:4034
        __func__ = "g_main_loop_run"
#21 0x0000000000408d29 in main (argc=1, argv=0x7fffffffe548) at gclue-main.c:192
        owner_id = 1
        error = 0x0
        context = <optimized out>
        config = <optimized out>

Reply at:
https://bugs.launchpad.net/ubuntu/+source/geoclue-2.0/+bug/1517793/comments/6


** Changed in: geoclue
       Status: Unknown => Confirmed

** Changed in: geoclue
   Importance: Unknown => High

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https://bugs.launchpad.net/bugs/1517793

Title:
  geoclue crashed with SIGSEGV

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