According to the comment in qapi/error.h, dereferencing @errp requires ERRP_GUARD():
* = Why, when and how to use ERRP_GUARD() = * * Without ERRP_GUARD(), use of the @errp parameter is restricted: * - It must not be dereferenced, because it may be null. ... * ERRP_GUARD() lifts these restrictions. * * To use ERRP_GUARD(), add it right at the beginning of the function. * @errp can then be used without worrying about the argument being * NULL or &error_fatal. * * Using it when it's not needed is safe, but please avoid cluttering * the source with useless code. In nubus_virtio_mmio_realize(), @errp is dereferenced without ERRP_GUARD(). Although nubus_virtio_mmio_realize() - as a DeviceClass.realize() method - is never passed a null @errp argument, it should follow the rules on @errp usage. Add the ERRP_GUARD() there. Reviewed-by: Markus Armbruster <arm...@redhat.com> Signed-off-by: Zhao Liu <zhao1....@intel.com> --- v2: Used Markus' words in commit message and added his r/b tag. --- hw/nubus/nubus-virtio-mmio.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/nubus/nubus-virtio-mmio.c b/hw/nubus/nubus-virtio-mmio.c index 58a63c84d0be..a5558d3ec28b 100644 --- a/hw/nubus/nubus-virtio-mmio.c +++ b/hw/nubus/nubus-virtio-mmio.c @@ -23,6 +23,7 @@ static void nubus_virtio_mmio_set_input_irq(void *opaque, int n, int level) static void nubus_virtio_mmio_realize(DeviceState *dev, Error **errp) { + ERRP_GUARD(); NubusVirtioMMIODeviceClass *nvmdc = NUBUS_VIRTIO_MMIO_GET_CLASS(dev); NubusVirtioMMIO *s = NUBUS_VIRTIO_MMIO(dev); NubusDevice *nd = NUBUS_DEVICE(dev); -- 2.34.1