[libvirt] [PATCH v3 1/6] pc: fix possible NULL pointer dereference in pc_machine_get_device_memory_region_size()
QEMU will crash when device-memory-region-size property is read if ms->device_memory
wasn't initialized yet (ex: property being inspected during preconfig time).
Instead of crashing return 0 if ms->device_memory hasn't been initialized.
Signed-off-by: Igor Mammedov <imammedo(a)redhat.com>
---
hw/i386/pc.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index d98b737..de91e90 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -2461,7 +2461,11 @@ pc_machine_get_device_memory_region_size(Object *obj, Visitor *v,
Error **errp)
{
MachineState *ms = MACHINE(obj);
- int64_t value = memory_region_size(&ms->device_memory->mr);
+ int64_t value = 0;
+
+ if (ms->device_memory) {
+ memory_region_size(&ms->device_memory->mr);
+ }
visit_type_int(v, name, &value, errp);
}
--
2.7.4