[PULL 16/17] hw/pci-host: pnv_phb{3, 4}: Fix heap out-of-bound access failure

[Daniel Henrique Barboza <danielhb413@gmail.com>]

From: Xuzhou Cheng <xuzhou.cheng@windriver.com>

pnv_phb3_root_bus_info and pnv_phb4_root_bus_info are missing the
instance_size initialization. This results in accessing out-of-bound
memory when setting 'chip-id' and 'phb-id', and eventually crashes
glib's malloc functionality with the following message:

  "qemu-system-ppc64: GLib: ../glib-2.72.3/glib/gmem.c:131: failed to allocate 3232 bytes"

This issue was noticed only when running qtests with QEMU Windows
32-bit executable. Windows 64-bit, Linux 32/64-bit do not expose
this bug though.

Fixes: 9ae1329ee2fe ("ppc/pnv: Add models for POWER8 PHB3 PCIe Host bridge")
Fixes: 4f9924c4d4cf ("ppc/pnv: Add models for POWER9 PHB4 PCIe Host bridge")
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Xuzhou Cheng <xuzhou.cheng@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Message-Id: <20220920103159.1865256-29-bmeng.cn@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb3.c | 1 +
 hw/pci-host/pnv_phb4.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/hw/pci-host/pnv_phb3.c b/hw/pci-host/pnv_phb3.c
index af8575c007..9054c393a2 100644
--- a/hw/pci-host/pnv_phb3.c
+++ b/hw/pci-host/pnv_phb3.c
@@ -1169,6 +1169,7 @@ static void pnv_phb3_root_bus_class_init(ObjectClass *klass, void *data)
 static const TypeInfo pnv_phb3_root_bus_info = {
     .name = TYPE_PNV_PHB3_ROOT_BUS,
     .parent = TYPE_PCIE_BUS,
+    .instance_size = sizeof(PnvPHB3RootBus),
     .class_init = pnv_phb3_root_bus_class_init,
 };
 
diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index 824e1a73fb..ccbde841fc 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -1773,6 +1773,7 @@ static void pnv_phb4_root_bus_class_init(ObjectClass *klass, void *data)
 static const TypeInfo pnv_phb4_root_bus_info = {
     .name = TYPE_PNV_PHB4_ROOT_BUS,
     .parent = TYPE_PCIE_BUS,
+    .instance_size = sizeof(PnvPHB4RootBus),
     .class_init = pnv_phb4_root_bus_class_init,
 };
 
-- 
2.37.3