Merge mysql.com:/home/mydev/mysql-4.1-bug19835

into  mysql.com:/home/mydev/mysql-5.0-ateam

myisam/mi_dynrec.c

@@ -1155,6 +1155,9 @@ int _mi_read_dynamic_record(MI_INFO *info, my_off_t filepos, byte *buf)
 	  info->rec_cache.pos_in_file <= block_info.next_filepos &&
 	  flush_io_cache(&info->rec_cache))
 	goto err;
+      /* A corrupted table can have wrong pointers. (Bug# 19835) */
+      if (block_info.next_filepos == HA_OFFSET_ERROR)
+        goto panic;
       info->rec_cache.seek_not_done=1;
       if ((b_type=_mi_get_block_info(&block_info,file,
 				     block_info.next_filepos))