From 00b8702581f312aa46f797a8b3153d9b2892d967 Mon Sep 17 00:00:00 2001 From: Daniel Oram Date: Thu, 10 Nov 2016 12:42:07 +0000 Subject: qdev: Fix assert in PCI address property when used by vfio-pci Allow the PCIHostDeviceAddress structure to work as the host property in vfio-pci when it has it's default value of all fields set to ~0. In this form the property indicates a non-existant device but given the field bit sizes gets asserted as excess (and invalid) precision overflows the string buffer. The BDF of an invalid device "FFFF:FF:FF.F" is returned instead. Signed-off-by: Daniel Oram Reviewed-by: Alex Williamson Message-Id: <71f06765c4ba16dcd71cbf78e877619948f04ed9.1478777270.git.daniel.oram@gmail.com> Signed-off-by: Eduardo Habkost --- hw/core/qdev-properties.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'hw') diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index 311af6d..2a82768 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -705,13 +705,19 @@ static void get_pci_host_devaddr(Object *obj, Visitor *v, const char *name, DeviceState *dev = DEVICE(obj); Property *prop = opaque; PCIHostDeviceAddress *addr = qdev_get_prop_ptr(dev, prop); - char buffer[] = "xxxx:xx:xx.x"; + char buffer[] = "ffff:ff:ff.f"; char *p = buffer; int rc = 0; - rc = snprintf(buffer, sizeof(buffer), "%04x:%02x:%02x.%d", - addr->domain, addr->bus, addr->slot, addr->function); - assert(rc == sizeof(buffer) - 1); + /* + * Catch "invalid" device reference from vfio-pci and allow the + * default buffer representing the non-existant device to be used. + */ + if (~addr->domain || ~addr->bus || ~addr->slot || ~addr->function) { + rc = snprintf(buffer, sizeof(buffer), "%04x:%02x:%02x.%0d", + addr->domain, addr->bus, addr->slot, addr->function); + assert(rc == sizeof(buffer) - 1); + } visit_type_str(v, name, &p, errp); } -- cgit v1.1