DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D98192075B
MIME-Version: 1.0
References: <20181119154311.27826-1-luiz.dentz@gmail.com> <CABBYNZK90H=0e4GKo1g96jYkg3EM+5C2DhbCvi-Cgtd8W+E3YA@mail.gmail.com>
In-Reply-To: <CABBYNZK90H=0e4GKo1g96jYkg3EM+5C2DhbCvi-Cgtd8W+E3YA@mail.gmail.com>
From:   Gal Ben Haim <gbenhaim@augury.com>
Date:   Tue, 20 Nov 2018 11:30:53 +0200
Message-ID: <CAHotPr_8M4H_6sLV+BK02QBKLwwAn0cEOFhyoMN5F0=_gY1dHQ@mail.gmail.com>
Subject: Re: [PATCH BlueZ 1/5] gatt: Fix invalid read when disconnecting
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc:     linux-bluetooth@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Sender: linux-bluetooth-owner@vger.kernel.org
Precedence: bulk

I can't apply this patch, not to the revision in master and not to the 5.50 tag

On Tue, Nov 20, 2018 at 10:50 AM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> On Mon, Nov 19, 2018 at 5:43 PM Luiz Augusto von Dentz
> <luiz.dentz@gmail.com> wrote:
> >
> > From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> >
> > In case there is a client of AcquireNotify and a disconnect happens the
> > code not only have to free the client object but also destroy the io
> > associated with it, for this reason the client object cannot be freed
> > until the io is destroyed otherwise it may lead to the following error:
> >
> > Invalid read of size 4
> >    at 0x63920: notify_io_destroy (gatt-client.c:1461)
> >    by 0x63EDB: pipe_io_destroy (gatt-client.c:1082)
> >    by 0x6405B: characteristic_free (gatt-client.c:1663)
> >    by 0x81F33: remove_interface (object.c:667)
> >    by 0x826CB: g_dbus_unregister_interface (object.c:1391)
> >    by 0x85D2B: queue_remove_all (queue.c:354)
> >    by 0x635F7: unregister_service (gatt-client.c:1893)
> >    by 0x85CF7: queue_remove_all (queue.c:339)
> >    by 0x661DF: btd_gatt_client_service_removed (gatt-client.c:2199)
> >    by 0x695CB: gatt_service_removed (device.c:3747)
> >    by 0x85B17: queue_foreach (queue.c:220)
> >    by 0x91283: notify_service_changed (gatt-db.c:280)
> >    by 0x91283: gatt_db_service_destroy (gatt-db.c:291)
> >  Address 0x515ed48 is 0 bytes inside a block of size 20 free'd
> >    at 0x483EAD0: free (vg_replace_malloc.c:530)
> >    by 0x85D2B: queue_remove_all (queue.c:354)
> >    by 0x636D3: unregister_characteristic (gatt-client.c:1741)
> >    by 0x85D2B: queue_remove_all (queue.c:354)
> >    by 0x635F7: unregister_service (gatt-client.c:1893)
> >    by 0x85CF7: queue_remove_all (queue.c:339)
> >    by 0x661DF: btd_gatt_client_service_removed (gatt-client.c:2199)
> >    by 0x695CB: gatt_service_removed (device.c:3747)
> >    by 0x85B17: queue_foreach (queue.c:220)
> >    by 0x91283: notify_service_changed (gatt-db.c:280)
> >    by 0x91283: gatt_db_service_destroy (gatt-db.c:291)
> >    by 0x85D2B: queue_remove_all (queue.c:354)
> >    by 0x91387: gatt_db_clear_range (gatt-db.c:475)
> > ---
> >  src/gatt-client.c | 24 ++++++++++++------------
> >  1 file changed, 12 insertions(+), 12 deletions(-)
> >
> > diff --git a/src/gatt-client.c b/src/gatt-client.c
> > index 234f46ed7..55aa5e423 100644
> > --- a/src/gatt-client.c
> > +++ b/src/gatt-client.c
> > @@ -1645,13 +1645,22 @@ static const GDBusMethodTable characteristic_methods[] = {
> >         { }
> >  };
> >
> > +static void remove_client(void *data)
> > +{
> > +       struct notify_client *ntfy_client = data;
> > +       struct btd_gatt_client *client = ntfy_client->chrc->service->client;
> > +
> > +       queue_remove(client->all_notify_clients, ntfy_client);
> > +
> > +       notify_client_unref(ntfy_client);
> > +}
> > +
> >  static void characteristic_free(void *data)
> >  {
> >         struct characteristic *chrc = data;
> >
> >         /* List should be empty here */
> >         queue_destroy(chrc->descs, NULL);
> > -       queue_destroy(chrc->notify_clients, NULL);
> >
> >         if (chrc->write_io) {
> >                 queue_remove(chrc->service->client->ios, chrc->write_io->io);
> > @@ -1663,6 +1672,8 @@ static void characteristic_free(void *data)
> >                 pipe_io_destroy(chrc->notify_io);
> >         }
> >
> > +       queue_destroy(chrc->notify_clients, remove_client);
> > +
> >         g_free(chrc->path);
> >         free(chrc);
> >  }
> > @@ -1715,16 +1726,6 @@ static struct characteristic *characteristic_create(
> >         return chrc;
> >  }
> >
> > -static void remove_client(void *data)
> > -{
> > -       struct notify_client *ntfy_client = data;
> > -       struct btd_gatt_client *client = ntfy_client->chrc->service->client;
> > -
> > -       queue_remove(client->all_notify_clients, ntfy_client);
> > -
> > -       notify_client_unref(ntfy_client);
> > -}
> > -
> >  static void unregister_characteristic(void *data)
> >  {
> >         struct characteristic *chrc = data;
> > @@ -1738,7 +1739,6 @@ static void unregister_characteristic(void *data)
> >         if (chrc->write_op)
> >                 bt_gatt_client_cancel(gatt, chrc->write_op->id);
> >
> > -       queue_remove_all(chrc->notify_clients, NULL, NULL, remove_client);
> >         queue_remove_all(chrc->descs, NULL, NULL, unregister_descriptor);
> >
> >         g_dbus_unregister_interface(btd_get_dbus_connection(), chrc->path,
> > --
> > 2.17.2
>
> Can you try with this set to see it does work properly.
>
> --
> Luiz Augusto von Dentz