From 64919d978e4cc910a4475f77c0f04b866051935d Mon Sep 17 00:00:00 2001
From: John Ferlan <jferlan@redhat.com>
Date: Fri, 31 May 2013 07:26:30 -0400
Subject: [PATCH] Check for existence of interface prior to setting terminate
 flag

https://bugzilla.redhat.com/show_bug.cgi?id=903480

During domain destruction it's possible that the learnIPAddressThread has
already removed the interface prior to the teardown filter path being run.
The teardown code would only be telling the thread to terminate.
---
 src/nwfilter/nwfilter_learnipaddr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/nwfilter/nwfilter_learnipaddr.c b/src/nwfilter/nwfilter_learnipaddr.c
index 2b493337f9..eabcf94e5c 100644
--- a/src/nwfilter/nwfilter_learnipaddr.c
+++ b/src/nwfilter/nwfilter_learnipaddr.c
@@ -251,6 +251,14 @@ virNWFilterTerminateLearnReq(const char *ifname) {
     int ifindex;
     virNWFilterIPAddrLearnReqPtr req;
 
+    /* It's possible that it's already been removed as a result of
+     * virNWFilterDeregisterLearnReq during learnIPAddressThread() exit
+     */
+    if (virNetDevExists(ifname) != 1) {
+        virResetLastError();
+        return 0;
+    }
+
     if (virNetDevGetIndex(ifname, &ifindex) < 0) {
         virResetLastError();
         return rc;
-- 
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