@@ -423,6 +423,11 @@ static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
uint64_t val = 0;
+
+ if (vdev == NULL) {
+ return UINT64_MAX;
+ }
+
if (addr < config) {
return virtio_ioport_read(proxy, addr);
}
@@ -454,6 +459,11 @@ static void virtio_pci_config_write(void *opaque, hwaddr addr,
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+
+ if (vdev == NULL) {
+ return;
+ }
+
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
Now, if virtio device is not present on virtio-bus - pci config callbacks will not lead to possible crush. The read will return "-1" which should be interpreted by a driver that pci device may be unplugged. Signed-off-by: Andrew Melnychenko <andrew@daynix.com> --- hw/virtio/virtio-pci.c | 10 ++++++++++ 1 file changed, 10 insertions(+)