From 54cdaa1bad3885448ef39faad93d40be3b223519 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Wed, 27 Oct 2010 20:03:43 +0200
Subject: [PATCH] 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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tap.c b/net/tap.c
index 4afb314fde..937d9429eb 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -279,6 +279,7 @@ static void tap_cleanup(VLANClientState *nc)
 
     if (s->vhost_net) {
         vhost_net_cleanup(s->vhost_net);
+        s->vhost_net = NULL;
     }
 
     qemu_purge_queued_packets(nc);
-- 
2.11.4.GIT