|
 |
28f2e1 |
From 529a5d908f5d16714b8ae0a51eaaaa84994dfae8 Mon Sep 17 00:00:00 2001
|
|
|
28f2e1 |
From: "Michael S. Tsirkin" <mst@redhat.com>
|
|
|
28f2e1 |
Date: Tue, 21 Dec 2021 09:45:44 -0500
|
|
|
28f2e1 |
Subject: [PATCH 1/2] acpi: validate hotplug selector on access
|
|
|
28f2e1 |
MIME-Version: 1.0
|
|
|
28f2e1 |
Content-Type: text/plain; charset=UTF-8
|
|
|
28f2e1 |
Content-Transfer-Encoding: 8bit
|
|
|
28f2e1 |
|
|
|
28f2e1 |
RH-Author: Jon Maloy <jmaloy@redhat.com>
|
|
|
28f2e1 |
RH-MergeRequest: 97: acpi: validate hotplug selector on access
|
|
|
28f2e1 |
RH-Commit: [1/1] 79bcfb0df0091e2b716d2e1c545f047b3409c26c (jmaloy/qemu-kvm)
|
|
|
28f2e1 |
RH-Bugzilla: 2036580
|
|
|
28f2e1 |
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
28f2e1 |
RH-Acked-by: Daniel P. Berrangé <berrange@redhat.com>
|
|
|
28f2e1 |
RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
|
|
|
28f2e1 |
|
|
|
28f2e1 |
When bus is looked up on a pci write, we didn't
|
|
|
28f2e1 |
validate that the lookup succeeded.
|
|
|
28f2e1 |
Fuzzers thus can trigger QEMU crash by dereferencing the NULL
|
|
|
28f2e1 |
bus pointer.
|
|
|
28f2e1 |
|
|
|
28f2e1 |
Fixes: b32bd763a1 ("pci: introduce acpi-index property for PCI device")
|
|
|
28f2e1 |
Fixes: CVE-2021-4158
|
|
|
28f2e1 |
Cc: "Igor Mammedov" <imammedo@redhat.com>
|
|
|
28f2e1 |
Fixes: https://gitlab.com/qemu-project/qemu/-/issues/770
|
|
|
28f2e1 |
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
|
28f2e1 |
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
|
28f2e1 |
Reviewed-by: Ani Sinha <ani@anisinha.ca>
|
|
|
28f2e1 |
(cherry picked from commit 9bd6565ccee68f72d5012e24646e12a1c662827e)
|
|
|
28f2e1 |
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
|
|
|
28f2e1 |
---
|
|
|
28f2e1 |
hw/acpi/pcihp.c | 3 +++
|
|
|
28f2e1 |
1 file changed, 3 insertions(+)
|
|
|
28f2e1 |
|
|
|
28f2e1 |
diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
|
|
|
28f2e1 |
index 30405b5113..a5e182dd3a 100644
|
|
|
28f2e1 |
--- a/hw/acpi/pcihp.c
|
|
|
28f2e1 |
+++ b/hw/acpi/pcihp.c
|
|
|
28f2e1 |
@@ -491,6 +491,9 @@ static void pci_write(void *opaque, hwaddr addr, uint64_t data,
|
|
|
28f2e1 |
}
|
|
|
28f2e1 |
|
|
|
28f2e1 |
bus = acpi_pcihp_find_hotplug_bus(s, s->hotplug_select);
|
|
|
28f2e1 |
+ if (!bus) {
|
|
|
28f2e1 |
+ break;
|
|
|
28f2e1 |
+ }
|
|
|
28f2e1 |
QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
|
|
|
28f2e1 |
Object *o = OBJECT(kid->child);
|
|
|
28f2e1 |
PCIDevice *dev = PCI_DEVICE(o);
|
|
|
28f2e1 |
--
|
|
|
28f2e1 |
2.27.0
|
|
|
28f2e1 |
|