darwin: Fix crash in log handler when stopping event thread
The darwin event thread (in contrast to other OS implementations) tries
to log to the context that created it. However, this context is only
guaranteed to be valid until the thread has started. It may be that
another context is the last one to be destroyed, causing the event
thread to log using an already destroyed context.
Fix this by only passing on ctx where it is acceptable.
Fixes #1108
diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index a457f95..388dbca 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -494,6 +494,7 @@
io_iterator_t libusb_rem_device_iterator;
io_iterator_t libusb_add_device_iterator;
+ /* ctx must only be used for logging during thread startup */
usbi_dbg (ctx, "creating hotplug event source");
runloop = CFRunLoopGetCurrent ();
@@ -515,7 +516,7 @@
kresult = IOServiceAddMatchingNotification (libusb_notification_port, kIOTerminatedNotification,
IOServiceMatching(darwin_device_class),
darwin_devices_detached,
- ctx, &libusb_rem_device_iterator);
+ NULL, &libusb_rem_device_iterator);
if (kresult != kIOReturnSuccess) {
usbi_err (ctx, "could not add hotplug event source: %s", darwin_error_str (kresult));
@@ -528,7 +529,7 @@
kresult = IOServiceAddMatchingNotification(libusb_notification_port, kIOFirstMatchNotification,
IOServiceMatching(darwin_device_class),
darwin_devices_attached,
- ctx, &libusb_add_device_iterator);
+ NULL, &libusb_add_device_iterator);
if (kresult != kIOReturnSuccess) {
usbi_err (ctx, "could not add hotplug event source: %s", darwin_error_str (kresult));
@@ -553,7 +554,7 @@
/* run the runloop */
CFRunLoopRun();
- usbi_dbg (ctx, "darwin event thread exiting");
+ usbi_dbg (NULL, "darwin event thread exiting");
/* signal the main thread that the hotplug runloop has finished. */
pthread_mutex_lock (&libusb_darwin_at_mutex);
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index a04468b..30dad67 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11720
+#define LIBUSB_NANO 11722
