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Bug#11765252 - READ OF FREED MEMORY WHEN "USE DB" AND

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"SHOW PROCESSLIST"

Merging from 5.1 to 5.5
This commit is contained in:
Praveenkumar Hulakund
2013-08-21 10:44:22 +05:30
parent fcc0011438 3b1e98d218
commit 7fffec875a
5 changed files with 33 additions and 10 deletions
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9
sql/sql_db.cc
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@ -1,5 +1,5 @@
/*
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -1302,9 +1302,12 @@ static void mysql_change_db_impl(THD *thd,
we just call THD::reset_db(). Since THD::reset_db() does not releases
the previous database name, we should do it explicitly.
*/
my_free(thd->db);
mysql_mutex_lock(&thd->LOCK_thd_data);
if (thd->db)
my_free(thd->db);
DEBUG_SYNC(thd, "after_freeing_thd_db");
thd->reset_db(new_db_name->str, new_db_name->length);
mysql_mutex_unlock(&thd->LOCK_thd_data);
}
/* 2. Update security context. */