On Mon, 2016-03-21 at 04:02 +0100, Fabiano Fidêncio wrote:
> g_task_return_error() has been completing the task immediately, not
> cleaning up/setting up the device state to STATE_DISCONNECTED. It's
> been
> causing a double free when trying to redirect a device without having
> the ACL permissions for doing it. See the backtrace:
>
> #0 0x00007ffff24dc07d in g_type_check_instance_is_fundamentally_a (
> type_instance=type_instance@entry=0x14779d0, fundamental_type=fundame
> ntal_type@entry=80) at gtype.c:4032
> #1 0x00007ffff24bc447 in g_object_unref (_object=0x14779d0) at
> gobject.c:3076
> #2 0x00007ffff7bafc2a in connect_cb (gobject=0x87d9a0
> [SpiceUsbDeviceManager], res=0x96f830, user_data=0x143e0e0)
> at usb-device-widget.c:485
> #3 0x00007ffff277f5a3 in g_task_return_now (task=0x96f830 [GTask])
> at gtask.c:1106
> #4 0x00007ffff277fc4e in g_task_return (task=0x96f830 [GTask],
> type=<optimized out>) at gtask.c:1164
> #5 0x00007ffff786c277 in
> spice_usb_device_manager_channel_connect_cb (gobject=0x917940
> [SpiceUsbredirChannel], channel_res=0x96f900, user_data=0x96f830) at
> usb-device-manager.c:1094
> #6 0x00007ffff277f5a3 in g_task_return_now (task=0x96f900 [GTask])
> at gtask.c:1106
> #7 0x00007ffff277fc4e in g_task_return (task=0x96f900 [GTask],
> type=<optimized out>) at gtask.c:1164
> #8 0x00007ffff786699c in spice_usbredir_channel_open_acl_cb
> (gobject=0xa73b00 [SpiceUsbAclHelper], acl_res=0x96f9d0,
> user_data=0x917940) at channel-usbredir.c:300
> #9 0x00007ffff277f5a3 in g_task_return_now (task=0x96f9d0 [GTask])
> at gtask.c:1106
> #10 0x00007ffff277fc4e in g_task_return (task=0x96f9d0 [GTask],
> type=<optimized out>) at gtask.c:1164
> #11 0x00007ffff27804d0 in g_task_return_new_error (task=0x96f9d0
> [GTask], domain=<optimized out>, code=<optimized out>,
> format=<optimized out>) at gtask.c:1744
> #12 0x00007ffff786eade in cb_out_watch (channel=0x1488740,
> cond=G_IO_IN, user_data=0xa73b00) at usb-acl-helper.c:128
> #13 0x00007ffff21b8e3a in g_main_context_dispatch (context=0x647390)
> at gmain.c:3154
> #14 0x00007ffff21b8e3a in g_main_context_dispatch (context=context@e
> ntry=0x647390) at gmain.c:3769
> #15 0x00007ffff21b91d0 in g_main_context_iterate (context=0x647390,
> block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
> at gmain.c:3840
> #16 0x00007ffff21b94f2 in g_main_loop_run (loop=0x13d1ae0) at
> gmain.c:4034
> #17 0x00007ffff3ca5440 in gtk_dialog_run () at /lib64/libgtk-3.so.0
> #18 0x0000000000406a18 in menu_cb_select_usb_devices
> (action=0x9d62f0 [GtkAction], data=0x69aef0) at spicy.c:394
> #22 0x00007ffff24d28ff in <emit signal ??? on instance 0x9d62f0
> [GtkAction]> (instance=<optimized out>, signal_id=<optimized out>,
> detail=<optimized out>) at gsignal.c:3439
> #19 0x00007ffff24b77a5 in g_closure_invoke (closure=0xa0d0c0, re
> turn_value=return_value@entry=0x0, n_param_values=1, param_values=par
> am_values@entry=0x7fffffffcf70, invocation_hint=invocation_hint@entry
> =0x7fffffffcef0) at gclosure.c:801
> #20 0x00007ffff24c9851 in signal_emit_unlocked_R (node=node@entr
> y=0x63fc10, detail=detail@entry=0, instance=instance@entry=0x9d62f0,
> emission_return=emission_return@entry=0x0, instance_and_params=instan
> ce_and_params@entry=0x7fffffffcf70) at gsignal.c:3627
> #21 0x00007ffff24d2530 in g_signal_emit_valist
> (instance=<optimized out>, signal_id=<optimized out>,
> detail=<optimized out>, var_args=var_args@entry=0x7fffffffd130) at
> gsignal.c:3383
> #23 0x00007ffff3bc23b0 in _gtk_action_emit_activate () at
> /lib64/libgtk-3.so.0
> #27 0x00007ffff24d28ff in <emit signal ??? on instance 0x9a8730
> [GtkImageMenuItem]> (instance=<optimized out>, signal_id=<optimized
> out>, detail=<optimized out>) at gsignal.c:3439
> #24 0x00007ffff24b77a5 in g_closure_invoke (closure=closure@entr
> y=0x6607d0, return_value=return_value@entry=0x0, n_param_values=1, pa
> ram_values=param_values@entry=0x7fffffffd3f0, invocation_hint=invocat
> ion_hint@entry=0x7fffffffd370) at gclosure.c:801
> #25 0x00007ffff24c938c in signal_emit_unlocked_R (node=node@entr
> y=0x661050, detail=detail@entry=0, instance=instance@entry=0x9a8730,
> emission_return=emission_return@entry=0x0, instance_and_params=instan
> ce_and_params@entry=0x7fffffffd3f0) at gsignal.c:3557
> #26 0x00007ffff24d2530 in g_signal_emit_valist
> (instance=<optimized out>, signal_id=<optimized out>,
> detail=<optimized out>, var_args=var_args@entry=0x7fffffffd5b0) at
> gsignal.c:3383
> #28 0x00007ffff3e7094e in gtk_widget_activate () at /lib64/libgtk-
> 3.so.0
> #29 0x00007ffff3d4e4f6 in gtk_menu_shell_activate_item () at
> /lib64/libgtk-3.so.0
> #30 0x00007ffff3d4e824 in gtk_menu_shell_button_release () at
> /lib64/libgtk-3.so.0
> #31 0x00007ffff3d30fda in _gtk_marshal_BOOLEAN__BOXEDv () at
> /lib64/libgtk-3.so.0
> #32 0x00007ffff24b79d4 in _g_closure_invoke_va (closure=closure@entr
> y=0x644d10, return_value=return_value@entry=0x7fffffffd900, instance=
> instance@entry=0x80faa0, args=args@entry=0x7fffffffd9d0,
> n_params=<optimized out>, param_types=0x644d40) at gclosure.c:864
> #33 0x00007ffff24d1dd3 in g_signal_emit_valist (instance=0x80faa0,
> signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffff
> ffd9d0) at gsignal.c:3292
> #34 0x00007ffff24d28ff in g_signal_emit (instance=<optimized out>,
> signal_id=<optimized out>, detail=<optimized out>) at gsignal.c:3439
> #35 0x00007ffff3e6e4bc in gtk_widget_event_internal () at
> /lib64/libgtk-3.so.0
> #36 0x00007ffff3d2e34e in propagate_event () at /lib64/libgtk-3.so.0
> #37 0x00007ffff3d300fc in gtk_main_do_event () at /lib64/libgtk-
> 3.so.0
> #38 0x00007ffff38a8e92 in gdk_event_source_dispatch () at
> /lib64/libgdk-3.so.0
> #39 0x00007ffff21b8e3a in g_main_context_dispatch (context=0x647390)
> at gmain.c:3154
> #40 0x00007ffff21b8e3a in g_main_context_dispatch (context=context@e
> ntry=0x647390) at gmain.c:3769
> #41 0x00007ffff21b91d0 in g_main_context_iterate (context=0x647390,
> block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
> at gmain.c:3840
> #42 0x00007ffff21b94f2 in g_main_loop_run (loop=0x6e2730) at
> gmain.c:4034
> #43 0x000000000040b2f9 in main (argc=1, argv=0x7fffffffde48) at
> spicy.c:1920
>
> Signed-off-by: Fabiano Fidêncio <fiden...@redhat.com>
Tested-by: Pavel Grunt <pgr...@redhat.com>
Acked-by: Pavel Grunt <pgr...@redhat.com>
Thanks,
Pavel
> ---
> src/channel-usbredir.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/channel-usbredir.c b/src/channel-usbredir.c
> index d95a6c5..dca8455 100644
> --- a/src/channel-usbredir.c
> +++ b/src/channel-usbredir.c
> @@ -297,12 +297,12 @@ static void spice_usbredir_channel_open_acl_cb(
> spice_usbredir_channel_open_device(channel, &err);
> }
> if (err) {
> - g_task_return_error(priv->task, err);
> libusb_unref_device(priv->device);
> priv->device = NULL;
> g_boxed_free(spice_usb_device_get_type(), priv-
> >spice_device);
> priv->spice_device = NULL;
> priv->state = STATE_DISCONNECTED;
> + g_task_return_error(priv->task, err);
> } else {
> g_task_return_boolean(priv->task, TRUE);
> }
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