ACPICA: Fix for LoadTable operator, input strings

Fixed a problem with the LoadTable operator where the OemId
and OemTableId input strings could cause unexpected failures if
they were shorter than the maximum lengths allowed.

http://www.acpica.org/bugzilla/show_bug.cgi?id=576

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/executer/exconfig.c b/drivers/acpi/executer/exconfig.c
index 52b1e95..ed92fb5 100644 (file)
--- a/drivers/acpi/executer/exconfig.c
+++ b/drivers/acpi/executer/exconfig.c
@@ -236,7 +236,7 @@ acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
        status = acpi_get_table_by_index(table_index, &table);
        if (ACPI_SUCCESS(status)) {
                ACPI_INFO((AE_INFO,
-                          "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
+                          "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]",
                           table->signature, table->oem_id,
                           table->oem_table_id));
        }
@@ -472,8 +472,5 @@ acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 
        acpi_tb_set_table_loaded_flag(table_index, FALSE);
 
-       /* Delete the table descriptor (ddb_handle) */
-
-       acpi_ut_remove_reference(table_desc);
        return_ACPI_STATUS(AE_OK);
 }

diff --git a/drivers/acpi/tables/tbfind.c b/drivers/acpi/tables/tbfind.c
index 058c064..772ca41 100644 (file)
--- a/drivers/acpi/tables/tbfind.c
+++ b/drivers/acpi/tables/tbfind.c
@@ -70,12 +70,22 @@ acpi_tb_find_table(char *signature,
 {
        acpi_native_uint i;
        acpi_status status;
+       struct acpi_table_header header;
 
        ACPI_FUNCTION_TRACE(tb_find_table);
 
+       /* Normalize the input strings */
+
+       ACPI_MEMSET(&header, 0, sizeof(struct acpi_table_header));
+       ACPI_STRNCPY(header.signature, signature, ACPI_NAME_SIZE);
+       ACPI_STRNCPY(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
+       ACPI_STRNCPY(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
+
+       /* Search for the table */
+
        for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
                if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
-                               signature, ACPI_NAME_SIZE)) {
+                               header.signature, ACPI_NAME_SIZE)) {
 
                        /* Not the requested table */
 
@@ -104,20 +114,24 @@ acpi_tb_find_table(char *signature,
 
                if (!ACPI_MEMCMP
                    (acpi_gbl_root_table_list.tables[i].pointer->signature,
-                    signature, ACPI_NAME_SIZE) && (!oem_id[0]
-                                                   ||
-                                                   !ACPI_MEMCMP
-                                                   (acpi_gbl_root_table_list.
-                                                    tables[i].pointer->oem_id,
-                                                    oem_id, ACPI_OEM_ID_SIZE))
+                    header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
+                                                          ||
+                                                          !ACPI_MEMCMP
+                                                          (acpi_gbl_root_table_list.
+                                                           tables[i].pointer->
+                                                           oem_id,
+                                                           header.oem_id,
+                                                           ACPI_OEM_ID_SIZE))
                    && (!oem_table_id[0]
                        || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
-                                       pointer->oem_table_id, oem_table_id,
+                                       pointer->oem_table_id,
+                                       header.oem_table_id,
                                        ACPI_OEM_TABLE_ID_SIZE))) {
                        *table_index = i;
 
                        ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
-                                         "Found table [%4.4s]\n", signature));
+                                         "Found table [%4.4s]\n",
+                                         header.signature));
                        return_ACPI_STATUS(AE_OK);
                }
        }