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spapr_pci: Fix potential NULL pointer dereference in spapr_dt_pci_bus() 

Commit 14e714900f refactored the call to spapr_dt_drc(),
introducing a potential NULL pointer dereference while
accessing bus->parent_dev.
A trivial audit show 'bus' is not null in the two places
the static function spapr_dt_drc() is called.

Since the 'bus' parameter is not NULL in both callers, remove
remove the test on if (bus), and add an assert() to silent
static analyzers.

This fixes:

  /hw/ppc/spapr_pci.c: 1367 in spapr_dt_pci_bus()
  >>>     CID 1401933:  Null pointer dereferences  (FORWARD_NULL)
  >>>     Dereferencing null pointer "bus".
  1367         ret = spapr_dt_drc(fdt, offset, OBJECT(bus->parent_dev),
  1368                            SPAPR_DR_CONNECTOR_TYPE_PCI);

Fixes: 14e714900f
Reported-by: Coverity (CID 1401933)
Suggested-by: Greg Kurz <groug@kaod.org>
Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190613213406.22053-1-philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
master
Philippe Mathieu-Daudé 2019-06-13 23:34:06 +02:00 committed by David Gibson
parent c29a0b0fb3
commit 740a19313b
1 changed files with 5 additions and 6 deletions
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11
hw/ppc/spapr_pci.c
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@ -1356,12 +1356,11 @@ static int spapr_dt_pci_bus(SpaprPhbState *sphb, PCIBus *bus,
_FDT(fdt_setprop_cell(fdt, offset, "#size-cells",
RESOURCE_CELLS_SIZE));
if (bus) {
pci_for_each_device_reverse(bus, pci_bus_num(bus),
spapr_dt_pci_device_cb, &cbinfo);
if (cbinfo.err) {
return cbinfo.err;
}
assert(bus);
pci_for_each_device_reverse(bus, pci_bus_num(bus),
spapr_dt_pci_device_cb, &cbinfo);
if (cbinfo.err) {
return cbinfo.err;
}
ret = spapr_dt_drc(fdt, offset, OBJECT(bus->parent_dev),