device-port: fire port available changed hook after streams are moved

If port becomes unavailable then PA_CORE_HOOK_PORT_AVAILABLE_CHANGED
callbacks may eventually destroy related source or sink object. Call
this hook after stream is moved to prevent crash reading from freed
memory.

Fixes: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1008

1 files changed, 5 insertions, 2 deletions

diff --git a/src/pulsecore/device-port.c b/src/pulsecore/device-port.c
index 8263c9e9b..4f9235e51 100644
--- a/src/pulsecore/device-port.c
+++ b/src/pulsecore/device-port.c
@@ -119,8 +119,6 @@ void pa_device_port_set_available(pa_device_port *p, pa_available_t status) {
         if (source)
             pa_subscription_post(p->core, PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE, source->index);
 
-        pa_hook_fire(&p->core->hooks[PA_CORE_HOOK_PORT_AVAILABLE_CHANGED], p);
-
         /* A sink or source whose active port is unavailable can't be the
          * default sink/source, so port availability changes may affect the
          * default sink/source choice. */
@@ -146,6 +144,11 @@ void pa_device_port_set_available(pa_device_port *p, pa_available_t status) {
                     pa_core_move_streams_to_newly_available_preferred_source(p->core, source);
             }
         }
+
+        /* This may cause the sink and source pointers to become invalid, if
+         * the availability change causes the card profile to get switched. If
+         * you add code after this line, remember to take that into account. */
+        pa_hook_fire(&p->core->hooks[PA_CORE_HOOK_PORT_AVAILABLE_CHANGED], p);
     }
 }