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[PATCH] hw/pci: Fix crash when running QEMU with "-nic model=rocker"

From: Thomas Huth
Subject: [PATCH] hw/pci: Fix crash when running QEMU with "-nic model=rocker"
Date: Wed, 27 May 2020 17:31:52 +0200

QEMU currently aborts when being started with "-nic model=rocker" or with
"-net nic,model=rocker". This happens because the "rocker" device is not
a normal NIC but a switch, which has different properties. Thus we should
only consider real NIC devices for "-nic" and "-net". These devices can
be identified by the "netdev" property, so check for this property before
adding the device to the list.

Reported-by: Michael Tokarev <address@hidden>
Fixes: 52310c3fa7dc854d ("net: allow using any PCI NICs in -net or -nic")
Signed-off-by: Thomas Huth <address@hidden>
 hw/pci/pci.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 70c66965f5..46214f8287 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1887,7 +1887,18 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus 
         if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) &&
             dc->user_creatable) {
             const char *name = object_class_get_name(list->data);
-            g_ptr_array_add(pci_nic_models, (gpointer)name);
+            /*
+             * A network device might also be something else than a NIC, see
+             * e.g. the "rocker" device. Thus we have to look for the "netdev"
+             * property, too. Unfortunately, some devices like virtio-net only
+             * create this property during instance_init, so we have to create
+             * a temporary instance here to be able to check it.
+             */
+            Object *obj = object_new_with_class(OBJECT_CLASS(dc));
+            if (object_property_find(obj, "netdev", NULL)) {
+                g_ptr_array_add(pci_nic_models, (gpointer)name);
+            }
+            object_unref(obj);
         next = list->next;

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