This is a note to let you know that I've just added the patch titled
ACPI: ioapic: Clear on-stack resource before using it
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-ioapic-clear-on-stack-resource-before-using-it.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e3d5092b6756b9e0b08f94bbeafcc7afe19f0996 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <jroedel@xxxxxxx>
Date: Wed, 22 Mar 2017 18:33:23 +0100
Subject: ACPI: ioapic: Clear on-stack resource before using it
From: Joerg Roedel <jroedel@xxxxxxx>
commit e3d5092b6756b9e0b08f94bbeafcc7afe19f0996 upstream.
The on-stack resource-window 'win' in setup_res() is not
properly initialized. This causes the pointers in the
embedded 'struct resource' to contain stale addresses.
These pointers (in my case the ->child pointer) later get
propagated to the global iomem_resources list, causing a #GP
exception when the list is traversed in
iomem_map_sanity_check().
Fixes: c183619b63ec (x86/irq, ACPI: Implement ACPI driver to support IOAPIC hotplug)
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/ioapic.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/acpi/ioapic.c
+++ b/drivers/acpi/ioapic.c
@@ -45,6 +45,12 @@ static acpi_status setup_res(struct acpi
struct resource *res = data;
struct resource_win win;
+ /*
+ * We might assign this to 'res' later, make sure all pointers are
+ * cleared before the resource is added to the global list
+ */
+ memset(&win, 0, sizeof(win));
+
res->flags = 0;
if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM) == 0)
return AE_OK;
Patches currently in stable-queue which might be from jroedel@xxxxxxx are
queue-4.4/acpi-ioapic-clear-on-stack-resource-before-using-it.patch