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pci: move dereferencing of root only after verifying valid root pointer 

Signed-off-by: Saravanakumar <saravanakumar.punith@gmail.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Saravanakumar 2014-05-22 17:03:50 +05:30 committed by Michael Tokarev
parent e35f29ded3
commit b645000e1a
1 changed files with 2 additions and 2 deletions
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4
hw/pci/pci.c
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@ -605,13 +605,13 @@ PCIBus *pci_get_bus_devfn(int *devfnp, PCIBus *root, const char *devaddr)
int dom, bus; int dom, bus;
unsigned slot; unsigned slot;
assert(!root->parent_dev);
if (!root) { if (!root) {
fprintf(stderr, "No primary PCI bus\n"); fprintf(stderr, "No primary PCI bus\n");
return NULL; return NULL;
} }
assert(!root->parent_dev);
if (!devaddr) { if (!devaddr) {
*devfnp = -1; *devfnp = -1;
return pci_find_bus_nr(root, 0); return pci_find_bus_nr(root, 0);