linux-kernel - [PATCH] dmi: Avoid unaligned memory access in save_mem

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Date:	Fri, 01 Nov 2013 13:59:52 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Chen Gong <gong.chen@...ux.intel.com>
Subject: [PATCH] dmi: Avoid unaligned memory access in save_mem_devices()

Firmware is not required to maintain alignment of SMBIOS entries,
so we should take care accessing fields within these structures.
Use "get_unaligned()" to avoid problems.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---

Ingo: belongs on top of the patches already in x86/mce branch
Found on ia64 (which grumbles about unaligned access)

 drivers/firmware/dmi_scan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 59579a744d58..c7e81ff8f3ef 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -8,6 +8,7 @@
 #include <linux/bootmem.h>
 #include <linux/random.h>
 #include <asm/dmi.h>
+#include <asm/unaligned.h>
 
 /*
  * DMI stands for "Desktop Management Interface".  It is part
@@ -347,7 +348,7 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v)
 		pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
 		return;
 	}
-	dmi_memdev[nr].handle = dm->handle;
+	dmi_memdev[nr].handle = get_unaligned(&dm->handle);
 	dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
 	dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
 	nr++;
-- 
1.8.4.1

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