File libvirt-Check-for-existence-of-interface-prior-to-setting-terminate-flag.patch of Package libvirt

From f0728b9d85e3346e04bd8438df02402273b17835 Mon Sep 17 00:00:00 2001
Message-Id: <f0728b9d85e3346e04bd8438df02402273b17835@dist-git>
From: John Ferlan <jferlan@redhat.com>
Date: Fri, 11 Apr 2014 07:49:21 -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.

(cherry picked from commit 64919d978e4cc910a4475f77c0f04b866051935d)
Signed-off-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 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 1d31a46..9dface8 100644
--- a/src/nwfilter/nwfilter_learnipaddr.c
+++ b/src/nwfilter/nwfilter_learnipaddr.c
@@ -250,6 +250,14 @@ 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;
-- 
1.9.2