From 89f244ba7c305e4193d1d7c860ef0c3fba579603 Mon Sep 17 00:00:00 2001
From: "Daniel P. Berrange" <berrange@redhat.com>
Date: Mon, 31 Mar 2014 12:25:17 +0100
Subject: [PATCH] Preserve error when tearing down nwfilter rules

When a VM fails to launch due to error creating nwfilter
rules, we must avoid overwriting the original error when
tearing down the partially created rules.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 src/qemu/qemu_command.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 403c9a9d3..6d800421c 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7640,8 +7640,12 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
 
     ret = 0;
  cleanup:
-    if (ret < 0)
+    if (ret < 0) {
+        virErrorPtr saved_err = virSaveLastError();
         virDomainConfNWFilterTeardown(net);
+        virSetError(saved_err);
+        virFreeError(saved_err);
+    }
     for (i = 0; tapfd && i < tapfdSize && tapfd[i] >= 0; i++) {
         if (ret < 0)
             VIR_FORCE_CLOSE(tapfd[i]);
-- 
2.39.5