[patch 3/3] acpi: check for pxm_to_node_map overflow

[Cyrill Gorcunov]

It is hardly (if ever) possible but in case of broken _PXM
entry we could reach out of pxm_to_node_map array
bounds in acpi_map_pxm_to_node() call. Lets check it
(it's not that expensive and safe).

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
CC: Len Brown <lenb@xxxxxxxxxx>
---
 drivers/acpi/numa.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.git/drivers/acpi/numa.c
===================================================================
--- linux-2.6.git.orig/drivers/acpi/numa.c
+++ linux-2.6.git/drivers/acpi/numa.c
@@ -278,7 +278,7 @@ int acpi_get_node(acpi_handle *handle)
 	int pxm, node = -1;
 
 	pxm = acpi_get_pxm(handle);
-	if (pxm >= 0)
+	if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 		node = acpi_map_pxm_to_node(pxm);
 
 	return node;

-- 
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