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hw/pci: use-after-free in pci_nic_init_nofail when nic device fails to initialize 

object_property_set_bool(OBJECT(dev), true, "realized", &err) in
pci_nic_init_nofail may release the object if device fails to
initialize which leads to use-after-free in error handling block.
qdev_init_nofail does the same thing while holding the reference.

(gdb) run -net nic
qemu-system-x86_64: failed to find romfile "efi-e1000.rom"

Program received signal SIGSEGV, Segmentation fault.
object_unparent (obj=0x7fffe96a0010) at qom/object.c:440
440     in qom/object.c
(gdb) bt
<nd_table>, rootbus=0x5555567ed990, default_model=<optimized out>,
default_devaddr=<optimized out>) at hw/pci/pci.c:1812
pci_bus=0x5555567ed990) at hw/i386/pc.c:1634
pci_type=0x555555c1a523 "i440FX", host_type=0x555555ba564e
"i440FX-pcihost") at hw/i386/pc_piix.c:241
out>, envp=<optimized out>) at vl.c:4481

Signed-off-by: Alex Kompel <barbos@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Alex Kompel 2017-01-06 15:48:27 -08:00 committed by Jason Wang
parent 581f7b127d
commit a023b7ac62
1 changed files with 1 additions and 8 deletions
hw/pci
pci.c

9
hw/pci/pci.c
View File

@ -1779,7 +1779,6 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
const char *default_devaddr)
{
const char *devaddr = nd->devaddr ? nd->devaddr : default_devaddr;
Error *err = NULL;
PCIBus *bus;
PCIDevice *pci_dev;
DeviceState *dev;
@ -1805,13 +1804,7 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
pci_dev = pci_create(bus, devfn, pci_nic_names[i]);
dev = &pci_dev->qdev;
qdev_set_nic_properties(dev, nd);
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err) {
error_report_err(err);
object_unparent(OBJECT(dev));
exit(1);
}
qdev_init_nofail(dev);
return pci_dev;
}