From 5adedba972c4148bb7cc800da850d8b38046eba1 Mon Sep 17 00:00:00 2001
From: Apple <opensource@apple.com>
Date: Thu, 17 Jun 2010 16:16:04 +0000
Subject: [PATCH] configd-293.5.tar.gz

---
 SystemConfiguration.fproj/SCNetworkReachability.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/SystemConfiguration.fproj/SCNetworkReachability.c b/SystemConfiguration.fproj/SCNetworkReachability.c
index 9d8c41e..6a8818d 100644
--- 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;
 }
-- 
2.50.0