[pulseaudio-discuss] [PATCH] bluetooth: Free backends before devices and adapters.

Juho Hämäläinen jusa at hilvi.org
Sun Jul 1 18:47:42 UTC 2018

On [ pe 29.06.18 18:54 ], Tanu Kaskinen wrote:
> On Thu, 2018-06-28 at 14:58 +0300, Juho Hämäläinen wrote:
> > When bluetooth daemon disappears gracefully transports are freed before
> > the daemon disappears from DBus bus. However if bluetooth daemon
> > segfaults or is killed abruptly the daemon disappears from the bus
> > before PulseAudio is able to clean the transports. As the devices
> > and adapters are freed before ofono or native backends, PulseAudio
> > segfaults when dangling pointers are used when freeing the backends.
> > Fix by freeing the backends before devices and adapters when bluetooth
> > daemon disappears from DBus bus.
> > 
> > Signed-off-by: Juho Hämäläinen <jusa at hilvi.org>
> > ---
> >  src/modules/bluetooth/bluez5-util.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> I suppose it's the hf_audio_card.transport pointers that are dangling?
> Rather than having unobvious ordering requirements, it would seem
> better to me to notify the backends when the transports are freed so
> that they can drop their references. There's already the destroy()
> callback that could be used for this. What do you think?

I was thinking the same, using destroy() callback with hf_audio_card,
but as it is more or less reasonable to free the transports before the
devices etc, I went with the simpler reordering instead. I can make new
patch with the destroy() callback as well.

- jusa

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