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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Tue, 20 Nov 2018 12:35:19 +0200
Message-ID: <CABBYNZJNM2SpM2w3kwuLw1FfXcoSZfyO02xCJAgdx-BBPyw7-w@mail.gmail.com>
Subject: Re: [PATCH BlueZ 1/5] gatt: Fix invalid read when disconnecting
To:     gbenhaim@augury.com
Cc:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
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Sender: linux-bluetooth-owner@vger.kernel.org
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Hi Gal,
On Tue, Nov 20, 2018 at 11:31 AM Gal Ben Haim <gbenhaim@augury.com> wrote:
>
> I can't apply this patch, not to the revision in master and not to the 5.50 tag

They are on top o master, how are you trying to apply them, with git am?

> 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


-- 
Luiz Augusto von Dentz