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x86/PCI: fix boundary checking when using root CRS

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Don't touch info->res_num if we are out of space.

Acked-by: Gary Hade <garyhade@us.ibm.com>
Tested-by: Gary Hade <garyhade@us.ibm.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yinghai Lu 2009-06-24 19:01:19 -07:00 committed by Jesse Barnes
parent 12abb8ba84
commit 2cdb3f1d83
1 changed files with 15 additions and 12 deletions
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27
arch/x86/pci/acpi.c
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@ -68,6 +68,10 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
unsigned long flags;
struct resource *root;
int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
u64 start, end;
if (bus_has_transparent_bridge(info->bus))
max_root_bus_resources -= 3;
status = resource_to_addr(acpi_res, &addr);
if (!ACPI_SUCCESS(status))
@ -84,25 +88,24 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
} else
return AE_OK;
res = &info->res[info->res_num];
res->name = info->name;
res->flags = flags;
res->start = addr.minimum + addr.translation_offset;
res->end = res->start + addr.address_length - 1;
res->child = NULL;
if (bus_has_transparent_bridge(info->bus))
max_root_bus_resources -= 3;
start = addr.minimum + addr.translation_offset;
end = start + addr.address_length - 1;
if (info->res_num >= max_root_bus_resources) {
printk(KERN_WARNING "PCI: Failed to allocate 0x%lx-0x%lx "
"from %s for %s due to _CRS returning more than "
"%d resource descriptors\n", (unsigned long) res->start,
(unsigned long) res->end, root->name, info->name,
"%d resource descriptors\n", (unsigned long) start,
(unsigned long) end, root->name, info->name,
max_root_bus_resources);
info->res_num++;
return AE_OK;
}
res = &info->res[info->res_num];
res->name = info->name;
res->flags = flags;
res->start = start;
res->end = end;
res->child = NULL;
if (insert_resource(root, res)) {
printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
"from %s for %s\n", (unsigned long) res->start,