virtio-serial: Fix segfault on guest boot

If I start qemu with:

  # qemu -hda disks/test.img -enable-kvm -m 1G -snapshot \
         -device virtio-serial \
         -chardev socket,host=localhost,port=1234,server,nowait,id=foo \
         -device virtserialport,chardev=foo,name=org.qemu.guest_agent

I get a segfault when booting a Fedora 14 guest. The backtrace says:

  Program terminated with signal 11, Segmentation fault.
    #0  0x0000000000420850 in handle_control_message (vser=0x3732bd0, buf=0x2c173e0, len=8) at /home/lcapitulino/src/qmp-unstable/hw/virtio-serial-bus.c:335
    335     info = DO_UPCAST(VirtIOSerialPortInfo, qdev, port->dev.info);

What's happening is VIRTIO_CONSOLE_DEVICE_READY is a message for the
whole device, not for an individual port. So port is NULL. This bug was
introduced by commit a15bb0d6.

This commit fixes that by making the port returned by find_port_by_id()
be used only by the VIRTIO_CONSOLE_PORT_READY and
VIRTIO_CONSOLE_PORT_OPEN messages.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

hw/virtio-serial-bus.c

@@ -328,18 +328,11 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
     cpkt.event = lduw_p(&gcpkt->event);
     cpkt.value = lduw_p(&gcpkt->value);
 
-    port = find_port_by_id(vser, ldl_p(&gcpkt->id));
-    if (!port && cpkt.event != VIRTIO_CONSOLE_DEVICE_READY)
-        return;
-
-    info = DO_UPCAST(VirtIOSerialPortInfo, qdev, port->dev.info);
-
-    switch(cpkt.event) {
-    case VIRTIO_CONSOLE_DEVICE_READY:
+    if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
         if (!cpkt.value) {
             error_report("virtio-serial-bus: Guest failure in adding device %s\n",
                          vser->bus.qbus.name);
-            break;
+            return;
         }
         /*
          * The device is up, we can now tell the device about all the
@@ -348,8 +341,19 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
         QTAILQ_FOREACH(port, &vser->ports, next) {
             send_control_event(port, VIRTIO_CONSOLE_PORT_ADD, 1);
         }
-        break;
+        return;
+    }
 
+    port = find_port_by_id(vser, ldl_p(&gcpkt->id));
+    if (!port) {
+        error_report("virtio-serial-bus: Unexpected port id %u for device %s\n",
+                     ldl_p(&gcpkt->id), vser->bus.qbus.name);
+        return;
+    }
+
+    info = DO_UPCAST(VirtIOSerialPortInfo, qdev, port->dev.info);
+
+    switch(cpkt.event) {
     case VIRTIO_CONSOLE_PORT_READY:
         if (!cpkt.value) {
             error_report("virtio-serial-bus: Guest failure in adding port %u for device %s\n",