linux-kernel - [PATCH] acpi: check for pxm_to_node

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Date:	Sat, 28 Feb 2009 18:17:47 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] acpi: check for pxm_to_node_map overflow

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.

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
CC: Len Brown <lenb@...nel.org>
---

It's a patch resend. I didn't get any response on
previous submission from Len, oh :(

Len is the patch really not needed or such a situation
can't happen?

 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
@@ -277,7 +277,7 @@ 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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