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[Qemu-devel] [PULL v2 09/30] hw/pci-bridge: Fix invalid free()

From: Michael S. Tsirkin
Subject: [Qemu-devel] [PULL v2 09/30] hw/pci-bridge: Fix invalid free()
Date: Tue, 18 Dec 2018 11:11:46 -0500

From: Matthias Weckbecker <address@hidden>

When loadvm'ing a *running* snapshot qemu crashes due to an invalid
free. It's fortunately caught early by glibc heap memory corruption
protection and qemu gets killed with SIGABRT.

Steps to reproduce:

1) Create VM (e.g w/ virsh define)
2) Start the VM and take a snapshot while it's running and having a
   PCI bridge attached
3) Destroy the VM and revert the running snapshot.

This commit fixes the issue.

Signed-off-by: Matthias Weckbecker <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
 hw/pci/pci_bridge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
index ee9dff2d3a..b9143ac88b 100644
--- a/hw/pci/pci_bridge.c
+++ b/hw/pci/pci_bridge.c
@@ -241,9 +241,9 @@ void pci_bridge_update_mappings(PCIBridge *br)
      * while another accesses an unaffected region. */
     pci_bridge_region_del(br, br->windows);
+    pci_bridge_region_cleanup(br, w);
     br->windows = pci_bridge_region_init(br);
-    pci_bridge_region_cleanup(br, w);
 /* default write_config function for PCI-to-PCI bridge */

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