From ee210d6390761bb0fd6febe0fb8f94ee0dcba0db Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 27 May 2011 14:46:27 +0200
Subject: [PATCH] usb-bus: Don't allow attaching a device to a bus with no free
 ports

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb-bus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/usb-bus.c b/hw/usb-bus.c
index 480956dfcf..0a49921c0c 100644
--- a/hw/usb-bus.c
+++ b/hw/usb-bus.c
@@ -181,6 +181,11 @@ static void do_attach(USBDevice *dev)
                 dev->product_desc);
         return;
     }
+    if (bus->nfree == 0) {
+        fprintf(stderr, "Warning: tried to attach usb device %s to a bus with no free ports\n",
+                dev->product_desc);
+        return;
+    }
     if (dev->port_path) {
         QTAILQ_FOREACH(port, &bus->free, next) {
             if (strcmp(port->path, dev->port_path) == 0) {
-- 
2.30.2