0c26f2eca4
visit_type_size() requires either visitor->type_size() or visitor_uint64() to be implemented, otherwise a NULL function pointer is invoked. It is possible to trigger this crash as follows: $ qemu-system-x86_64 -netdev tap,sndbuf=0,id=netdev0 \ -device virtio-blk-pci,netdev=netdev0 The 'sndbuf' option has type "size". Reviewed-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>