Addressed memory leak in SDL_coreaudio.m

src/audio/coreaudio/SDL_coreaudio.m

@@ -713,9 +713,33 @@ static int AssignDeviceToAudioQueue(SDL_AudioDevice *device)
     result = AudioObjectGetPropertyData(device->hidden->deviceID, &prop, 0, NULL, &devuidsize, &devuid);
     CHECK_RESULT("AudioObjectGetPropertyData (kAudioDevicePropertyDeviceUID)");
     result = AudioQueueSetProperty(device->hidden->audioQueue, kAudioQueueProperty_CurrentDevice, &devuid, devuidsize);
-    CHECK_RESULT("AudioQueueSetProperty (kAudioQueueProperty_CurrentDevice)");
 
-    // !!! FIXME: do we need to CFRelease(devuid)?
+    /*
+       If AudioObjectGetPropertyData succeeds and AudioQueueSetProperty fails,
+       calling CHECK_RESULT("AudioQueueSetProperty (kAudioQueueProperty_CurrentDevice)");
+       will cause a memory leak since it returns
+    */
+
+    // !!! FIXME: do we need to CFRelease(devuid)
+    /* Yes
+     CFStringRef is passed to AudioObjectGetPropertyData as an argument of type
+     UnsafeMutableRawPointer. As stated in the Apple Developer Documentation,
+     "The UnsafeMutableRawPointer type provides no automated memory management,
+     no type safety, and no alignment guarantees. You are responsible for
+     handling the life cycle of any memory you work with through
+     unsafe pointers, to avoid leaks or undefined behavior"
+    */
+
+    //This is the quickest fix
+    if (result != noErr) {
+            const char* msg = "AudioQueueSetProperty (kAudioQueueProperty_CurrentDevice)";
+            SDL_Log("COREAUDIO: Got error %d from '%s'!\n", (int)result, msg);
+            CFRelease(devuid);
+            return SDL_SetError("CoreAudio error (%s): %d", msg, (int)result);
+    }
+
+    //Release once you've finished using CFStringRef
+    CFRelease(devuid);
 
     return 0;
 }