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[Qemu-devel] [PATCH] hw/pci: use-after-free in pci_nic_init_nofail when

From: Alex Kompel
Subject: [Qemu-devel] [PATCH] hw/pci: use-after-free in pci_nic_init_nofail when nic device fails to initialize
Date: Fri, 6 Jan 2017 15:48:27 -0800

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
#0  object_unparent (obj=0x7fffe96a0010) at qom/object.c:440
#1  0x000055555598c30d in pci_nic_init_nofail (nd=0x55555616b460
<nd_table>, rootbus=0x5555567ed990, default_model=<optimized out>,
default_devaddr=<optimized out>) at hw/pci/pci.c:1812
#2  0x00005555557ff52c in pc_nic_init (isa_bus=0x55555733c610,
pci_bus=0x5555567ed990) at hw/i386/pc.c:1634
#3  0x00005555558021ad in pc_init1 (machine=0x55555661ee10,
pci_type=0x555555c1a523 "i440FX", host_type=0x555555ba564e
"i440FX-pcihost") at hw/i386/pc_piix.c:241
#4  0x00005555557519cb in main (argc=<optimized out>, argv=<optimized
out>, envp=<optimized out>) at vl.c:4481

Signed-off-by: Alex Kompel <address@hidden>
 hw/pci/pci.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 24fae16..2fd1b9e 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1805,13 +1805,7 @@ 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;

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