linux-kernel - [PATCH 12/85] ACPICA: Fix table compare code, length then data

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Message-id: <14ec9a5d33f848336a3f4b74633fc810658fa9b8.1223706853.git.len.brown@intel.com>
Date:	Sat, 11 Oct 2008 02:35:32 -0400
From:	Len Brown <lenb@...nel.org>
To:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Bob Moore <robert.moore@...el.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Len Brown <len.brown@...el.com>
Subject: [PATCH 12/85] ACPICA: Fix table compare code, length then data

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

Split the ACPI table compare. First check that the lengths match
exactly. Then compare the data.

Signed-off-by: Bob Moore <robert.moore@...el.com>
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/acpi/tables/tbinstal.c |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/tables/tbinstal.c b/drivers/acpi/tables/tbinstal.c
index 905dc38..18747ce 100644
--- a/drivers/acpi/tables/tbinstal.c
+++ b/drivers/acpi/tables/tbinstal.c
@@ -110,7 +110,6 @@ acpi_status
 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 {
 	u32 i;
-	u32 length;
 	acpi_status status = AE_OK;
 
 	ACPI_FUNCTION_TRACE(tb_add_table);
@@ -145,13 +144,18 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 			}
 		}
 
-		/* Check for a table match on the entire table length */
+		/*
+		 * Check for a table match on the entire table length,
+		 * not just the header.
+		 */
+		if (table_desc->length !=
+		    acpi_gbl_root_table_list.tables[i].length) {
+			continue;
+		}
 
-		length = ACPI_MIN(table_desc->length,
-				  acpi_gbl_root_table_list.tables[i].length);
 		if (ACPI_MEMCMP(table_desc->pointer,
 				acpi_gbl_root_table_list.tables[i].pointer,
-				length)) {
+				acpi_gbl_root_table_list.tables[i].length)) {
 			continue;
 		}
 
-- 
1.5.5.1

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