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