module-loopback: Never call adjust_rates after teardown

Calling adjust_rates after teardown results in segfault, and
judging from the Ubuntu bug report, this can happen.
Actively prevent this by destroying the time event, and by
setting adjust_time to 0, we also prevent this routine being
called on max request update.

BugLink: https://bugs.launchpad.net/bugs/946400
Signed-off-by: David Henningsson <david.henningsson@canonical.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/src/modules/module-loopback.c b/src/modules/module-loopback.c
index 5c87c6c7..ba624530 100644
--- a/src/modules/module-loopback.c
+++ b/src/modules/module-loopback.c
@@ -137,6 +137,13 @@ static void teardown(struct userdata *u) {
     pa_assert_ctl_context();
 
     pa_asyncmsgq_flush(u->asyncmsgq, 0);
+
+    u->adjust_time = 0;
+    if (u->time_event) {
+        u->core->mainloop->time_free(u->time_event);
+        u->time_event = NULL;
+    }
+
     if (u->sink_input)
         pa_sink_input_unlink(u->sink_input);
 
@@ -860,8 +867,5 @@ void pa__done(pa_module*m) {
     if (u->asyncmsgq)
         pa_asyncmsgq_unref(u->asyncmsgq);
 
-    if (u->time_event)
-        u->core->mainloop->time_free(u->time_event);
-
     pa_xfree(u);
 }