ACPICA: Fix table compare code, length then data

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

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/acpi/tables/tbinstal.c b/drivers/acpi/tables/tbinstal.c
index 905dc38ab23b..18747ce8dd2f 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;
                 }