I’m inspired by the function ‘ich9_pm_device_unplug_cb’. >From the ‘plug’ ich9_pm_device_plug_cb it set an error. So I think we can also set this is this s390 device plug.
I will send out revised patch soon. Thanks, Li Qiang 发件人: Cornelia Huck 发送时间: 2019年1月3日 22:54 收件人: Li Qiang 抄送: wall...@linux.ibm.com; r...@twiddle.net; da...@redhat.com; pa...@linux.ibm.com; borntrae...@de.ibm.com; qemu-s3...@nongnu.org; qemu-devel@nongnu.org; peter.mayd...@linaro.org; Pierre Morel 主题: Re: [PATCH] s390: avoid potential null dereference ins390_pcihost_unplug() On Thu, 3 Jan 2019 06:02:46 -0800 Li Qiang <liq...@163.com> wrote: > When getting the 'pbdev', the if...else has no default branch. > From Coverity, the 'pbdev' maybe null when the 'dev' is not > the TYPE_PCI_BRIDGE/TYPE_PCI_DEVICE/TYPE_S390_PCI_DEVICE. > > Spotted by Coverity: CID 1398593 > > Signed-off-by: Li Qiang <liq...@163.com> > --- > hw/s390x/s390-pci-bus.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c > index 15759b6514..b3122268a3 100644 > --- a/hw/s390x/s390-pci-bus.c > +++ b/hw/s390x/s390-pci-bus.c > @@ -956,6 +956,10 @@ static void s390_pcihost_unplug(HotplugHandler > *hotplug_dev, DeviceState *dev, > } else if (object_dynamic_cast(OBJECT(dev), TYPE_S390_PCI_DEVICE)) { > pbdev = S390_PCI_DEVICE(dev); > pci_dev = pbdev->pdev; > + } else { > + error_setg(errp, "s390: device unplug for not supported device" > + " type: %s", object_get_typename(OBJECT(dev))); > + return; I think that is something that really Should Not Happen. However, looking at s390_pcihost_plug, we just do nothing if the plugged device does not match any of the expected three values. Maybe we should also set an error in that case there? > } > > switch (pbdev->state) {