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authorJoerg Roedel <jroedel@suse.de>2017-03-22 20:33:23 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 00:31:45 +0300
commite3d5092b6756b9e0b08f94bbeafcc7afe19f0996 (patch)
tree27cbd2cc11667d378d267f5dbe525d5ec60890b0 /drivers/acpi/ioapic.c
parentc02ed2e75ef4c74e41e421acb4ef1494671585e8 (diff)
downloadlinux-e3d5092b6756b9e0b08f94bbeafcc7afe19f0996.tar.xz
ACPI: ioapic: Clear on-stack resource before using it
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@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/ioapic.c')
-rw-r--r--drivers/acpi/ioapic.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c
index 1120dfd625b8..7e4fbf9a53a3 100644
--- a/drivers/acpi/ioapic.c
+++ b/drivers/acpi/ioapic.c
@@ -45,6 +45,12 @@ static acpi_status setup_res(struct acpi_resource *acpi_res, void *data)
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))
return AE_OK;