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[libvirt] [PATCH] Bug Fix: Do not release network actual device in qemuBuildCommandLine on error

From: Roopa Prabhu <roprabhu cisco com>

For direct attach devices, in qemuBuildCommandLine, we seem to be freeing
actual device on error path (with networkReleaseActualDevice). But the actual
device is not deleted.

qemuProcessStop eventually deletes the direct attach device and releases actual device. But by the time qemuProcessStop is called qemuBuildCommandLine
has already freed actual device. Leaving stray macvtap devices behind on error.
So the simplest fix is to remove the networkReleaseActualDevice in
qemuBuildCommandLine. This patch does just that.

Does this look right ?. I have only verified this with direct and bridge mode.

The other option is to do both delMacvtap and networkReleaseActualDevice in
qemuBuildCommandLine instead of doing only networkReleaseActualDevice.
I do have a patch for this too.

Signed-off-by: Roopa Prabhu <roprabhu cisco com>
 src/qemu/qemu_command.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index bb12016..ba33a4a 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5378,8 +5378,6 @@ qemuBuildCommandLine(virConnectPtr conn,
     /* free up any resources in the network driver */
-    for (i = 0 ; i < def->nnets ; i++)
-        networkReleaseActualDevice(def->nets[i]);
     for (i = 0; i <= last_good_net; i++)

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