properly handle empty CFStringRefs.

diff --git a/libs/backends/coreaudio/coremidi_io.cc b/libs/backends/coreaudio/coremidi_io.cc
index c3bd868165c601ab39ad93e08b9ec6cc7da2aa5e..fd3b4c1db8b2bfd514f1cf2f840836cea2be322b 100644 (file)
--- a/libs/backends/coreaudio/coremidi_io.cc
+++ b/libs/backends/coreaudio/coremidi_io.cc
@@ -46,7 +46,11 @@ static void midiInputCallback(const MIDIPacketList *list, void *procRef, void *s
 static std::string getDisplayName(MIDIObjectRef object)
 {
        CFStringRef name = nil;
-       if (noErr != MIDIObjectGetStringProperty(object, kMIDIPropertyDisplayName, &name) && name) {
+       if (noErr != MIDIObjectGetStringProperty(object, kMIDIPropertyDisplayName, &name)) {
+               return "";
+       }
+       if (!CFStringGetCStringPtr(name, kCFStringEncodingUTF8)) {
+               if (name) CFRelease(name);
                return "";
        }
        std::string rv (CFStringGetCStringPtr(name, kCFStringEncodingUTF8));