[qemu-s390x] [PATCH] s390: avoid potential null dereference in s390_pcihost_unplug()

[Li Qiang]

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 <address@hidden>
---
 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;
     }
 
     switch (pbdev->state) {
-- 
2.17.1