setup_stream() crashes when calling set_nonblock() with an invalid
stream_fd.
On a new call, the ofono backend gets notified of a new connection.
The ofono backend sets the transport state to playing, and that triggers
a profile change, which sets up the stream for the first time.
Then module-bluetooth-policy sets up the loopbacks. The loopbacks get
fully initialized before the crash.
After module-bluetooth-policy has done its things, the execution
continues in the transport state change hook. The next hook user is
module-bluez5-device, whose handle_transport_state_change() function
gets called. It will then set up the stream again even though it's
already set up. I'm not sure if that's a some kind of a bug.
setup_stream() can handle the case where it's unnecessarily called,
though, so this second setup is not a big problem.
The crash happens, because the connection died due to POLLHUP in the IO
thread before the second setup_stream() call.
---
Changes in v2:
* Update comments and commit message
src/modules/bluetooth/module-bluez5-device.c | 26 ++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/src/modules/bluetooth/module-bluez5-device.c b/src/modules/bluetooth/module-bluez5-device.c
index 56c96054d..91c678223 100644
--- a/src/modules/bluetooth/module-bluez5-device.c
+++ b/src/modules/bluetooth/module-bluez5-device.c
@@ -753,6 +753,8 @@ static void setup_stream(struct userdata *u) {
struct pollfd *pollfd;
int one;
+ pa_assert(u->stream_fd >= 0);
+
/* return if stream is already set up */
if (u->stream_setup_done)
return;
@@ -829,7 +831,17 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
}
case PA_SOURCE_MESSAGE_SETUP_STREAM:
- setup_stream(u);
+ /* Skip stream setup if stream_fd has been invalidated.
+ This can occur if the stream has already been set up and
+ then immediately received POLLHUP. If the stream has
+ already been set up earlier, then this setup_stream()
+ call is redundant anyway, but currently the code
+ is such that this kind of unnecessary setup_stream()
+ calls can happen. */
+ if (u->stream_fd < 0)
+ pa_log_debug("Skip source stream setup while closing");
+ else
+ setup_stream(u);
return 0;
}
@@ -1007,7 +1019,17 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
}
case PA_SINK_MESSAGE_SETUP_STREAM:
- setup_stream(u);
+ /* Skip stream setup if stream_fd has been invalidated.
+ This can occur if the stream has already been set up and
+ then immediately received POLLHUP. If the stream has
+ already been set up earlier, then this setup_stream()
+ call is redundant anyway, but currently the code
+ is such that this kind of unnecessary setup_stream()
+ calls can happen. */
+ if (u->stream_fd < 0)
+ pa_log_debug("Skip sink stream setup while closing");
+ else
+ setup_stream(u);
return 0;
}
--
2.18.0
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