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| author | Joerg Roedel <jroedel@suse.de> | 2017-03-22 18:33:23 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-03-28 23:31:45 +0200 |
| commit | e3d5092b6756b9e0b08f94bbeafcc7afe19f0996 (patch) | |
| tree | 27cbd2cc11667d378d267f5dbe525d5ec60890b0 /drivers/acpi/ioapic.c | |
| parent | Linux 4.11-rc4 (diff) | |
| download | linux-e3d5092b6756b9e0b08f94bbeafcc7afe19f0996.tar.xz linux-e3d5092b6756b9e0b08f94bbeafcc7afe19f0996.zip | |
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.c | 6 |
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; |