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Bug#54812: assert in Diagnostics_area::set_ok_status

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during EXPLAIN

Before the patch, send_eof() of some subclasses of 
select_result (e.g., select_send::send_eof()) could 
handle being called after an error had occured while others 
could not. The methods that were not well-behaved would trigger
an ASSERT on debug builds. Release builds were not affected.

Consider the following query as an example for how the ASSERT
could be triggered:

A user without execute privilege on f() does
   SELECT MAX(key1) INTO @dummy FROM t1 WHERE f() < 1;
resulting in "ERROR 42000: execute command denied to user..." 

The server would end the query by calling send_eof(). The 
fact that the error had occured would make the ASSERT trigger. 

select_dumpvar::send_eof() was the offending method in the
bug report, but the problem also applied to other 
subclasses of select_result. This patch uniforms send_eof() 
of all subclasses of select_result to handle being called 
after an error has occured.
This commit is contained in:
Jorgen Loland
2010-11-15 16:18:04 +01:00
parent 616f90b372
commit 4bfd212177
6 changed files with 109 additions and 6 deletions
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29
mysql-test/r/not_embedded_server.result
View File

@ -14,3 +14,32 @@ flush privileges;
ERROR HY000: Table 'host' was not locked with LOCK TABLES
unlock tables;
drop table t1;
#
# Bug#54812: assert in Diagnostics_area::set_ok_status during EXPLAIN
#
CREATE USER nopriv_user@localhost;
connection: default
DROP TABLE IF EXISTS t1,t2,t3;
DROP FUNCTION IF EXISTS f;
CREATE TABLE t1 (key1 INT PRIMARY KEY);
CREATE TABLE t2 (key2 INT);
INSERT INTO t1 VALUES (1),(2);
CREATE FUNCTION f() RETURNS INT RETURN 1;
GRANT FILE ON *.* TO 'nopriv_user'@'localhost';
FLUSH PRIVILEGES;
connection: con1
SELECT MAX(key1) FROM t1 WHERE f() < 1 INTO OUTFILE 'mytest';
ERROR 42000: execute command denied to user 'nopriv_user'@'localhost' for routine 'test.f'
INSERT INTO t2 SELECT MAX(key1) FROM t1 WHERE f() < 1;
ERROR 42000: execute command denied to user 'nopriv_user'@'localhost' for routine 'test.f'
SELECT MAX(key1) INTO @dummy FROM t1 WHERE f() < 1;
ERROR 42000: execute command denied to user 'nopriv_user'@'localhost' for routine 'test.f'
CREATE TABLE t3 (i INT) AS SELECT MAX(key1) FROM t1 WHERE f() < 1;
ERROR 42000: execute command denied to user 'nopriv_user'@'localhost' for routine 'test.f'
connection: default
DROP TABLE t1,t2;
DROP FUNCTION f;
DROP USER nopriv_user@localhost;
#
# End Bug#54812
#