[libvirt] [PATCH 10/26] Preserve error when tearing down nwfilter rules

[Daniel P. Berrange]

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 at 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 379c094..e34e537 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7654,8 +7654,12 @@ 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]);
-- 
1.9.0