=== modified file 'mysys/my_fopen.c'
--- mysys/my_fopen.c	2013-07-25 19:33:10 +0000
+++ mysys/my_fopen.c	2013-11-07 02:35:51 +0000
@@ -67,10 +67,10 @@
       thread_safe_increment(my_stream_opened,&THR_LOCK_open);
       DBUG_RETURN(fd);				/* safeguard */
     }
+    char *dup_filename = (char*) my_strdup(key_memory_my_file_info,
+                                           filename,MyFlags);
     mysql_mutex_lock(&THR_LOCK_open);
-    if ((my_file_info[filedesc].name= (char*)
-	 my_strdup(key_memory_my_file_info,
-                   filename,MyFlags)))
+    if ((my_file_info[filedesc].name= dup_filename))
     {
       my_stream_opened++;
       my_file_total_opened++;