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BUG#21856: Prepared Statements: crash if bad create

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When statement to be prepared contained CREATE PROCEDURE, CREATE FUNCTION
or CREATE TRIGGER statements with a syntax error in it, the preparation
would fail with syntax error message, but the memory could be corrupted.

The problem occurred because we switch memroot when parse stored
routine or trigger definitions, and on parse error we restored the
original memroot only after performing some memory operations.  In more
detail:
 - prepared statement would activate its own memory root to parse
   the definition of the stored procedure.
 - SP would reset this memory root with its own memory root to
   parse SP statements
 - a syntax error would happen
 - prepared statement would restore the original memory root
 - stored procedure would restore what it thinks was the original
   memory root, but actually was the statement memory root.
That led to double free - in destruction of the statement and in
a next call to mysql_parse().

The solution is to restore memroot right after the failed parsing.
This commit is contained in:
kroki/tomash@moonlight.intranet
2006-10-19 14:43:52 +04:00
parent 0f057bfce5
commit 00b2fc6aff
4 changed files with 39 additions and 2 deletions
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9
sql/sql_parse.cc
View File

@@ -5852,14 +5852,19 @@ void mysql_parse(THD *thd, char *inBuf, uint length)
DBUG_ASSERT(thd->net.report_error);
DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
thd->is_fatal_error));
query_cache_abort(&thd->net);
lex->unit.cleanup();
/*
The first thing we do after parse error is freeing sp_head to
ensure that we have restored original memroot.
*/
if (thd->lex->sphead)
{
/* Clean up after failed stored procedure/function */
delete thd->lex->sphead;
thd->lex->sphead= NULL;
}
query_cache_abort(&thd->net);
lex->unit.cleanup();
}
thd->proc_info="freeing items";
thd->end_statement();