linux-kernel - [16/94] ACPICA: Fix possible buffer overflow during a field unit read operation

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Message-ID: <lsq.1369712993.426004329@decadent.org.uk>
Date:	Tue, 28 May 2013 04:49:53 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Lv Zheng" <lv.zheng@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Bob Moore" <robert.moore@...el.com>
Subject: [16/94] ACPICA: Fix possible buffer overflow during a field unit
 read operation

3.2.46-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bob Moore <robert.moore@...el.com>

commit 61388f9e5d93053cf399a356414f31f9b4814c6d upstream.

Can only happen under these conditions: 1) The DSDT version is 1,
meaning integers are 32-bits.  2) The field is between 33 and 64
bits long.

It applies cleanly back to ACPICA 20100806+ (Linux v2.6.37+).

Signed-off-by: Bob Moore <robert.moore@...el.com>
Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/acpi/acpica/exfldio.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/acpi/acpica/exfldio.c
+++ b/drivers/acpi/acpica/exfldio.c
@@ -702,7 +702,19 @@ acpi_ex_extract_from_field(union acpi_op
 
 	if ((obj_desc->common_field.start_field_bit_offset == 0) &&
 	    (obj_desc->common_field.bit_length == access_bit_width)) {
-		status = acpi_ex_field_datum_io(obj_desc, 0, buffer, ACPI_READ);
+		if (buffer_length >= sizeof(u64)) {
+			status =
+			    acpi_ex_field_datum_io(obj_desc, 0, buffer,
+						   ACPI_READ);
+		} else {
+			/* Use raw_datum (u64) to handle buffers < 64 bits */
+
+			status =
+			    acpi_ex_field_datum_io(obj_desc, 0, &raw_datum,
+						   ACPI_READ);
+			ACPI_MEMCPY(buffer, &raw_datum, buffer_length);
+		}
+
 		return_ACPI_STATUS(status);
 	}
 

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