commit 43849424cff82803011fad21074531a1101e514e
author Michael S. Tsirkin <mst@redhat.com> Wed Oct 27 20:03:43 2010 +0200
committer Anthony Liguori <aliguori@us.ibm.com> Tue Nov 16 08:40:07 2010 -0600
tree 4229dabaade45f130fdb0c2022347ed4af16fd16
parent 788954270d339b4b271e1a537a481e7068ba3591

tap: clear vhost_net backend on cleanup

Frontends calling tap_get_vhost_net get an invalid pointer after the
peer backend has been deleted. Jason Wang <jasowang@redhat.com> reports
this leading to a crash in ack_features when we remove the vhost-net
bakend of a virtio nic.

The fix is simply to clear the backend pointer.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

net/tap.c

diff --git a/net/tap.c b/net/tap.c
index 4afb314..937d942 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -279,6 +279,7 @@
 
     if (s->vhost_net) {
         vhost_net_cleanup(s->vhost_net);
+        s->vhost_net = NULL;
     }
 
     qemu_purge_queued_packets(nc);