[libvirt] [RFC PATCH 2/3] check for out-of-range virtio-serial ports

[Jonathan Lebon]

Virtio-serial ports that have a number too high are rejected. The
maximum port number is retrieved from the ports attribute of the
controller if present, otherwise defaulting to 31.
---
 src/conf/domain_conf.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2bade1b..bfb3a81 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -12257,6 +12257,26 @@ virDomainDefParseXML(xmlDocPtr xml,
                 maxport = 0;
             chr->info.addr.vioserial.port = maxport + 1;
         }
+
+        /* verify that port is not out of range */
+        if (chr->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_SERIAL) {
+            size_t j;
+            int maxports = 31;
+            for (j = 0; j < def->ncontrollers; j++) { /* get maximum supported ports for ctlr */
+                if (def->controllers[j]->type == VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL &&
+                    def->controllers[j]->idx == chr->info.addr.vioserial.controller) {
+                    maxports = (def->controllers[j]->opts.vioserial.ports != -1)
+                             ?  def->controllers[j]->opts.vioserial.ports : 31;
+                    break;
+                }
+            }
+            if (chr->info.addr.vioserial.port >= maxports) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("Port number %d of virtio-serial is too high (maximum is %d)"),
+                               chr->info.addr.vioserial.port, maxports-1);
+                goto error;
+            }
+        }
     }
     VIR_FREE(nodes);
 
-- 
1.8.3.1