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s390x/pci: check for invalid function handle

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broken guest may provide 0 (invalid) function handle to zpci
instructions. Since we use function handle 0 to indicate an empty
slot in the PHB we have to add an additional check to spot this
kind of error.

Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Frank Blaschka 2015-01-16 14:55:21 +01:00 committed by Cornelia Huck
parent c0eb33ab54
commit 5b324bbafc
1 changed files with 1 additions and 1 deletions
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2
hw/s390x/s390-pci-bus.c
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@ -170,7 +170,7 @@ S390PCIBusDevice *s390_pci_find_dev_by_fh(uint32_t fh)
S390pciState *s = S390_PCI_HOST_BRIDGE(
object_resolve_path(TYPE_S390_PCI_HOST_BRIDGE, NULL));
if (!s) {
if (!s || !fh) {
return NULL;
}