configd-293.5.tar.gz

diff --git a/SystemConfiguration.fproj/SCNetworkReachability.c b/SystemConfiguration.fproj/SCNetworkReachability.c
index 9d8c41e510e85049bb4e3beb0b8f9c1c813f2fe8..6a8818d9461dc323ebdf7afa20190c72f5113da8 100644 (file)
--- a/SystemConfiguration.fproj/SCNetworkReachability.c
+++ b/SystemConfiguration.fproj/SCNetworkReachability.c
@@ -2006,10 +2006,12 @@ dequeueAsyncDNSQuery(SCNetworkReachabilityRef target)
                targetPrivate->dnsRLS = NULL;
        }
 
-       CFMachPortInvalidate(targetPrivate->dnsPort);
-       CFRelease(targetPrivate->dnsPort);
-       targetPrivate->dnsPort = NULL;
-       targetPrivate->dnsMP = MACH_PORT_NULL;
+       if (targetPrivate->dnsPort != NULL) {
+               CFMachPortInvalidate(targetPrivate->dnsPort);
+               CFRelease(targetPrivate->dnsPort);
+               targetPrivate->dnsPort = NULL;
+               targetPrivate->dnsMP = MACH_PORT_NULL;
+       }
 
        return;
 }