bzr push into mysql-5.0-bugteam branch (Davi.Arnaut:2759 to 2760) Bug#41110 Bug#41112

[Davi Arnaut]

 2760 Davi Arnaut	2009-02-24
      Bug#41110: crash with handler command when used concurrently with alter table
      Bug#41112: crash in mysql_ha_close_table/get_lock_data with alter table
      
      The problem is that the server wasn't handling robustly failures
      to re-open a table during a HANDLER .. READ statement. If the
      table needed to be re-opened due to it's storage engine being
      altered to one that doesn't support HANDLER, a reference (dangling
      pointer) to a closed table could be left in place and accessed in
      later attempts to fetch from the table using the handler. Also,
      if the server failed to set a error message if the re-open
      failed. These problems could lead to server crashes or hangs.
      
      The solution is to remove any references to a closed table and
      to set a error if reopening a table during a HANDLER .. READ
      statement fails.
      
      There is no test case in this change set as the test depends on
      a testing feature only available on 5.1 and later.
     @ sql/sql_handler.cc
        Remove redundant reopen check.
        Set errors even if reopening table.
        Reset TABLE_LIST::table reference when the table is closed.

    modified:
      sql/sql_handler.cc
 2759 Tatiana A. Nurnberg	2009-02-24 [merge]
      automerge

    modified:
      client/mysql.cc
=== modified file 'sql/sql_handler.cc'
--- a/sql/sql_handler.cc	2007-10-12 13:55:46 +0000
+++ b/sql/sql_handler.cc	2009-02-24 09:15:21 +0000
@@ -151,6 +151,9 @@ static void mysql_ha_close_table(THD *th
     }
     VOID(pthread_mutex_unlock(&LOCK_open));
   }
+
+  /* Mark table as closed, ready for re-open if necessary. */
+  tables->table= NULL;
 }
 
 /*
@@ -168,8 +171,7 @@ static void mysql_ha_close_table(THD *th
     'reopen' is set when a handler table is to be re-opened. In this case,
     'tables' is the pointer to the hashed TABLE_LIST object which has been
     saved on the original open.
-    'reopen' is also used to suppress the sending of an 'ok' message or
-    error messages.
+    'reopen' is also used to suppress the sending of an 'ok' message.
 
   RETURN
     FALSE OK
@@ -205,8 +207,7 @@ bool mysql_ha_open(THD *thd, TABLE_LIST 
                     strlen(tables->alias) + 1))
     {
       DBUG_PRINT("info",("duplicate '%s'", tables->alias));
-      if (! reopen)
-        my_error(ER_NONUNIQ_TABLE, MYF(0), tables->alias);
+      my_error(ER_NONUNIQ_TABLE, MYF(0), tables->alias);
       goto err;
     }
   }
@@ -251,8 +252,7 @@ bool mysql_ha_open(THD *thd, TABLE_LIST 
   /* There can be only one table in '*tables'. */
   if (! (tables->table->file->table_flags() & HA_CAN_SQL_HANDLER))
   {
-    if (! reopen)
-      my_error(ER_ILLEGAL_HA, MYF(0), tables->alias);
+    my_error(ER_ILLEGAL_HA, MYF(0), tables->alias);
     goto err;
   }
 
@@ -464,8 +464,7 @@ retry:
 
   if (need_reopen)
   {
-    mysql_ha_close_table(thd, tables);
-    hash_tables->table= NULL;
+    mysql_ha_close_table(thd, hash_tables);
     /*
       The lock might have been aborted, we need to manually reset
       thd->some_tables_deleted because handler's tables are closed


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