Hi Szymon,
On Fri, Mar 25, 2016 at 5:11 PM, Szymon Janc <szymon.janc@xxxxxxxxxxx> wrote:
> This fix double free if outgoing connection failed. This was due to
> connection_lost() being called from avdtp_unref which could result
> in another call to connection_lost when session ref is already 0.
>
> Fix this in similar way pairing agent is handled: takes extra reference
> before calling callbacks and unref it before exit. Then only unref is
> suppose to free session.
>
> connect error: Host is down (112)
> profiles/audio/avdtp.c:connection_lost() Disconnected from 00:0C:8A:FB:D4:16
> profiles/audio/a2dp.c:discover_cb() err 0xfff000240
> profiles/audio/avdtp.c:avdtp_unref() 0x85a88f0: ref=1
> src/service.c:change_state() 0x7f7c710: device 00:0C:8A:FB:D4:16 profile
> a2dp-sink state changed: connecting -> disconnected (-11)
> src/device.c:device_profile_connected() a2dp-sink Resource temporarily
> unavailable (11)
> src/device.c:device_profile_connected() returning response to :1.37
> profiles/audio/a2dp.c:setup_unref() 0x85b0380: ref=0
> profiles/audio/a2dp.c:setup_free() 0x85b0380
> profiles/audio/avdtp.c:avdtp_unref() 0x85a88f0: ref=0
> profiles/audio/avdtp.c:connection_lost() Disconnected from 00:0C:8A:FB:D4:16
> profiles/audio/a2dp.c:discover_cb() err 0xfff000170
> profiles/audio/sink.c:sink_set_state() State changed /org/bluez/hci0/
> dev_00_0C_8A_FB_D4_16: SINK_STATE_CONNECTING -> SINK_STATE_DISCONNECTED
> profiles/audio/a2dp.c:channel_remove() chan 0x85a8780
> profiles/audio/avdtp.c:avdtp_free() 0x85a88f0
> Invalid free() / delete / delete[] / realloc()
> at 0x4C29CF0: free (vg_replace_malloc.c:530)
> by 0x50CE5ED: g_free (in /usr/lib64/libglib-2.0.so.0.4600.2)
> by 0x4177E3: finalize_discovery (avdtp.c:1039)
> by 0x41789A: connection_lost (avdtp.c:1114)
> by 0x41A7FD: avdtp_connect_cb (avdtp.c:2339)
> by 0x44CBFB: connect_cb (btio.c:232)
> by 0x50C8E39: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.4600.2)
> by 0x50C91CF: ??? (in /usr/lib64/libglib-2.0.so.0.4600.2)
> by 0x50C94F1: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.4600.2)
> by 0x40B7B7: main (main.c:687)
> Address 0x85b4c30 is 0 bytes inside a block of size 24 free'd
> at 0x4C29CF0: free (vg_replace_malloc.c:530)
> by 0x50CE5ED: g_free (in /usr/lib64/libglib-2.0.so.0.4600.2)
> by 0x4177E3: finalize_discovery (avdtp.c:1039)
> by 0x41789A: connection_lost (avdtp.c:1114)
> by 0x413EE2: setup_free (a2dp.c:163)
> by 0x413EE2: setup_unref (a2dp.c:178)
> by 0x413F5F: setup_cb_free (a2dp.c:201)
> by 0x41638D: finalize_discover (a2dp.c:346)
> by 0x41638D: discover_cb (a2dp.c:1855)
> by 0x4177DB: finalize_discovery (avdtp.c:1037)
> by 0x41789A: connection_lost (avdtp.c:1114)
> by 0x41A7FD: avdtp_connect_cb (avdtp.c:2339)
> by 0x44CBFB: connect_cb (btio.c:232)
> by 0x50C8E39: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.4600.2)
> Block was alloc'd at
> at 0x4C2A988: calloc (vg_replace_malloc.c:711)
> by 0x50CE530: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.4600.2)
> by 0x4190FB: avdtp_discover (avdtp.c:3186)
> by 0x416C19: a2dp_discover (a2dp.c:1872)
> by 0x413642: sink_setup_stream (sink.c:265)
> by 0x4136C4: sink_connect (sink.c:294)
> by 0x470165: btd_service_connect (service.c:238)
> by 0x47583C: connect_next.isra.18 (device.c:1455)
> by 0x478500: connect_profiles (device.c:1710)
> by 0x48EC4A: process_message.isra.5 (object.c:259)
> by 0x53DD1A2: ??? (in /usr/lib64/libdbus-1.so.3.14.6)
> by 0x53CE733: dbus_connection_dispatch (in /usr/lib64/libdbus-1.so.3.14.6)
> ---
> profiles/audio/avdtp.c | 21 +++++++++++++--------
> 1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/profiles/audio/avdtp.c b/profiles/audio/avdtp.c
> index 4f663d4..4f51b0d 100644
> --- a/profiles/audio/avdtp.c
> +++ b/profiles/audio/avdtp.c
> @@ -1105,6 +1105,8 @@ static void connection_lost(struct avdtp *session, int err)
> {
> char address[18];
>
> + session = avdtp_ref(session);
> +
> ba2str(device_get_address(session->device), address);
> DBG("Disconnected from %s", address);
>
> @@ -1115,10 +1117,7 @@ static void connection_lost(struct avdtp *session, int err)
>
> avdtp_set_state(session, AVDTP_SESSION_STATE_DISCONNECTED);
>
> - if (session->ref > 0)
> - return;
> -
> - avdtp_free(session);
> + avdtp_unref(session);
> }
>
> static gboolean disconnect_timeout(gpointer user_data)
> @@ -1171,12 +1170,18 @@ void avdtp_unref(struct avdtp *session)
> if (session->ref > 0)
> return;
>
> - if (session->state == AVDTP_SESSION_STATE_CONNECTED) {
> + switch(session->state) {
> + case AVDTP_SESSION_STATE_CONNECTED:
> set_disconnect_timer(session);
> - return;
> + break;
> + case AVDTP_SESSION_STATE_CONNECTING:
> + connection_lost(session, ECONNABORTED);
> + break;
> + case AVDTP_SESSION_STATE_DISCONNECTED:
> + default:
> + avdtp_free(session);
> + break;
> }
> -
> - connection_lost(session, ECONNABORTED);
> }
>
> struct avdtp *avdtp_ref(struct avdtp *session)
> --
> 2.6.2
Applied, thanks.
--
Luiz Augusto von Dentz
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