Hi Bastien,
On Thu, Nov 23, 2017 at 12:23 PM, Luiz Augusto von Dentz
<luiz.dentz@xxxxxxxxx> wrote:
> Hi Bastien,
>
> On Wed, Nov 22, 2017 at 3:50 PM, Bastien Nocera <hadess@xxxxxxxxxx> wrote:
>> Make control_disconnect() a no-op if control was already
>> disconnected and freed.
>>
>> bluetoothd[8436]: profiles/audio/avrcp.c:avrcp_disconnect() path /org/bluez/hci0/dev_38_71_DE_C0_FC_26
>> ==8436== Invalid read of size 8
>> ==8436== at 0x41FFB9: control_disconnect (control.c:130)
>> ==8436== by 0x469E0A: service_remove (service.c:177)
>> ==8436== by 0x475869: device_remove (device.c:4071)
>> ==8436== by 0x45DEF9: adapter_remove (adapter.c:5485)
>> ==8436== by 0x466B2A: adapter_cleanup (adapter.c:8679)
>> ==8436== by 0x40BE16: main (main.c:782)
>> ==8436== Address 0x84b8ac8 is 8 bytes inside a block of size 48 free'd
>> ==8436== at 0x4C30D18: free (vg_replace_malloc.c:530)
>> ==8436== by 0x50D44AD: g_free (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x488AED: remove_interface (object.c:667)
>> ==8436== by 0x488FE9: g_dbus_unregister_interface (object.c:1391)
>> ==8436== by 0x469E20: service_remove (service.c:179)
>> ==8436== by 0x475869: device_remove (device.c:4071)
>> ==8436== by 0x45DEF9: adapter_remove (adapter.c:5485)
>> ==8436== by 0x466B2A: adapter_cleanup (adapter.c:8679)
>> ==8436== by 0x40BE16: main (main.c:782)
>> ==8436== Block was alloc'd at
>> ==8436== at 0x4C31A1E: calloc (vg_replace_malloc.c:711)
>> ==8436== by 0x50D43F0: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x41FC09: control_init (control.c:320)
>> ==8436== by 0x42006D: control_init_remote (control.c:361)
>> ==8436== by 0x469D59: service_probe (service.c:160)
>> ==8436== by 0x46E464: probe_service (device.c:4207)
>> ==8436== by 0x46E4C2: dev_probe (device.c:4226)
>> ==8436== by 0x46989B: btd_profile_foreach (profile.c:708)
>> ==8436== by 0x47239D: device_probe_profiles (device.c:4285)
>> ==8436== by 0x50ED51C: g_slist_foreach (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x50ED54A: g_slist_free_full (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x45F1EE: load_devices (adapter.c:3864)
>> ==8436== by 0x465E59: adapter_register (adapter.c:7741)
>> ==8436== by 0x465E59: read_info_complete (adapter.c:8284)
>> ==8436== by 0x48D277: request_complete (mgmt.c:261)
>> ==8436== by 0x48DD44: can_read_data (mgmt.c:353)
>> ==8436== by 0x4999A2: watch_callback (io-glib.c:170)
>> ==8436== by 0x50CEBB6: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x50CEF5F: ??? (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x50CF271: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.5400.2)
>> ==8436== by 0x40BDE8: main (main.c:770)
>> ---
>> profiles/audio/control.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/profiles/audio/control.c b/profiles/audio/control.c
>> index edc4a98ce..707276d29 100644
>> --- a/profiles/audio/control.c
>> +++ b/profiles/audio/control.c
>> @@ -127,7 +127,7 @@ int control_disconnect(struct btd_service *service)
>> {
>> struct control *control = btd_service_get_user_data(service);
>>
>> - if (!control->session)
>> + if (!control || !control->session)
>> return -ENOTCONN;
>>
>> avctp_disconnect(control->session);
>> --
>> 2.14.3
>
> Applied, thanks.
Johan just pointed out that this is probably not fixing the problem
since it is not a NULL pointer deference as the pointer is valid,
instead what is probably happening is that control_unregister is being
which frees the control but as that is pointed by a second service
(probably both target and remote services are supported) that then
cause the crash you are experiencing.
--
Luiz Augusto von Dentz
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
