ACPICA: Fix for acpi_reallocate_root_table for incorrect root table copy

When copying the root table to the new allocation, the length
used was incorrect. The new size was used instead of the current
table size, meaning too much data was copied.

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

diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index 5217a6159a3107b52dfb16e6524f9f632389bf4d..684614d0d327b958d8ccfdf95bfae891f92d7866 100644 (file)
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -172,6 +172,7 @@ acpi_status acpi_reallocate_root_table(void)
 {
        struct acpi_table_desc *tables;
        acpi_size new_size;
+       acpi_size current_size;
 
        ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 
@@ -183,9 +184,15 @@ acpi_status acpi_reallocate_root_table(void)
                return_ACPI_STATUS(AE_SUPPORT);
        }
 
-       new_size = ((acpi_size) acpi_gbl_root_table_list.count +
-                   ACPI_ROOT_TABLE_SIZE_INCREMENT) *
-           sizeof(struct acpi_table_desc);
+       /*
+        * Get the current size of the root table and add the default
+        * increment to create the new table size.
+        */
+       current_size = (acpi_size)
+           acpi_gbl_root_table_list.count * sizeof(struct acpi_table_desc);
+
+       new_size = current_size +
+           (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
 
        /* Create new array and copy the old array */
 
@@ -194,10 +201,16 @@ acpi_status acpi_reallocate_root_table(void)
                return_ACPI_STATUS(AE_NO_MEMORY);
        }
 
-       ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
+       ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
 
-       acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
+       /*
+        * Update the root table descriptor. The new size will be the current
+        * number of tables plus the increment, independent of the reserved
+        * size of the original table list.
+        */
        acpi_gbl_root_table_list.tables = tables;
+       acpi_gbl_root_table_list.size =
+           acpi_gbl_root_table_list.count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
        acpi_gbl_root_table_list.flags =
            ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;