Extra safety fixes (probably not needed, but can't hurt)

sql/ha_innodb.cc:
  simple optimization
sql/sql_show.cc:
  Simple optimization

sql/ha_innodb.cc

@@ -395,12 +395,9 @@ innobase_mysql_print_thd(
 					but better be safe */
 		}
 		
-		for (i = 0; i < len && s[i]; i++);
-
-		memcpy(buf, s, i);	/* Use memcpy to reduce the timeframe
+                /* Use strmake to reduce the timeframe
                    for a race, compared to fwrite() */
-		buf[300] = '\0';	/* not needed, just extra safety */
-
+		i= (uint) (strmake(buf, s, len) - buf);
 		putc('\n', f);
 		fwrite(buf, 1, i, f);
 	}

sql/sql_parse.cc

@@ -1067,6 +1067,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       packet_length--;
     }
     /* We must allocate some extra memory for query cache */
+    thd->query_length= 0;                       // Extra safety: Avoid races
     if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
 						packet_length,
 						thd->db_length+2+
@@ -2982,8 +2983,8 @@ void mysql_parse(THD *thd, char *inBuf, uint length)
 {
   DBUG_ENTER("mysql_parse");
 
-  mysql_init_query(thd);
   thd->query_length = length;
+  mysql_init_query(thd);
   if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
   {
     LEX *lex=lex_start(thd, (uchar*) inBuf, length);

sql/sql_show.cc

@@ -1147,8 +1147,7 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
             races with query_length
           */
           uint length= min(max_query_length, tmp->query_length);
-          thd_info->query=(char*) thd->memdup(tmp->query,length+1);
-          thd_info->query[length]=0;
+          thd_info->query=(char*) thd->strmake(tmp->query,length);
         }
         thread_infos.append(thd_info);
       }