MySQL Build Team 2cf7f53bfc Backport into build-200907211706-5.0.82sp1 ...

> ------------------------------------------------------------
> revno: 2733
> revision-id: gshchepa@mysql.com-20090430192037-9p1etcynkglte2j3
> parent: aelkin@mysql.com-20090430143246-zfqaz0t7uoluzdz2
> committer: Gleb Shchepa <gshchepa@mysql.com>
> branch nick: mysql-5.0-bugteam
> timestamp: Fri 2009-05-01 00:20:37 +0500
> message:
>   Bug #37362: Crash in do_field_eq
>   
>   EXPLAIN EXTENDED of nested query containing a error:
>   
>      1054 Unknown column '...' in 'field list'
>   
>   may cause a server crash.
>   
>   
>   Parse error like described above forces a call to
>   JOIN::destroy() on malformed subquery.
>   That JOIN::destroy function closes and frees temporary
>   tables. However, temporary fields of these tables
>   may be listed in st_select_lex::group_list of outer
>   query, and that st_select_lex may not cleanup them
>   properly. So, after the JOIN::destroy call that
>   st_select_lex::group_list may have Item_field
>   objects with dangling pointers to freed temporary
>   table Field objects. That caused a crash.

2009-07-21 19:55:33 +02:00

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