[libvirt] [PATCH] qemu: fix crash when removing <filterref> from interface with update-device

If a domain network interface that contains a <filterref> is modified "live" using "virsh update-device --live", libvirtd would crash. This was because the code supporting live update of an interface's filterref was assuming that a filterref might be added or modified, but didn't account for removing the filterref, resulting in a null dereference of the filter name. Introduced with commit 258fb278, which was first in libvirt v1.0.1. This addresses https://bugzilla.redhat.com/show_bug.cgi?id=1093301 --- src/qemu/qemu_hotplug.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index ccfb358..cdf9eac 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -1815,7 +1815,8 @@ qemuDomainChangeNetFilter(virConnectPtr conn, virDomainConfNWFilterTeardown(olddev); - if (virDomainConfNWFilterInstantiate(conn, vm->def->uuid, newdev) < 0) { + if (newdev->filter && + virDomainConfNWFilterInstantiate(conn, vm->def->uuid, newdev) < 0) { virErrorPtr errobj; virReportError(VIR_ERR_OPERATION_FAILED, -- 1.9.0