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Bug #47412: Valgrind warnings / user can read uninitalized memory using

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SP variables

A function call may end without throwing an error or without setting 
the return value. This can happen when e.g. an error occurs while 
calculating the return value.

Fixed by setting the value to NULL when error occurs during evaluation
of an expression.
This commit is contained in:
Georgi Kodinov
2009-10-26 11:55:57 +02:00
parent 9a5a77eb68
commit 8363e26659
3 changed files with 125 additions and 14 deletions
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47
mysql-test/r/sp-bugs.result Normal file
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@ -0,0 +1,47 @@
#
# Bug #47412: Valgrind warnings / user can read uninitalized memory
# using SP variables
#
CREATE SCHEMA testdb;
USE testdb;
CREATE FUNCTION f2 () RETURNS INTEGER
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' SET @aux = 1;
RETURN f_not_exists () ;
END|
CREATE PROCEDURE p3 ( arg1 VARCHAR(32) )
BEGIN
CALL p_not_exists ( );
END|
# should not return valgrind warnings
CALL p3 ( f2 () );
ERROR 42000: PROCEDURE testdb.p_not_exists does not exist
DROP SCHEMA testdb;
CREATE SCHEMA testdb;
USE testdb;
CREATE FUNCTION f2 () RETURNS INTEGER
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' SET @aux = 1;
RETURN f_not_exists () ;
END|
CREATE PROCEDURE p3 ( arg2 INTEGER )
BEGIN
CALL p_not_exists ( );
END|
# should not return valgrind warnings
CALL p3 ( f2 () );
ERROR 42000: PROCEDURE testdb.p_not_exists does not exist
DROP SCHEMA testdb;
CREATE SCHEMA testdb;
USE testdb;
CREATE FUNCTION f2 () RETURNS INTEGER
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' SET @aux = 1;
RETURN f_not_exists () ;
END|
# should not return valgrind warnings
SELECT f2 ();
f2 ()
NULL
DROP SCHEMA testdb;
End of 5.1 tests

61
mysql-test/t/sp-bugs.test Normal file
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# Test file for stored procedure bugfixes
--echo #
--echo # Bug #47412: Valgrind warnings / user can read uninitalized memory
--echo # using SP variables
--echo #
CREATE SCHEMA testdb;
USE testdb;
DELIMITER |;
CREATE FUNCTION f2 () RETURNS INTEGER
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' SET @aux = 1;
RETURN f_not_exists () ;
END|
CREATE PROCEDURE p3 ( arg1 VARCHAR(32) )
BEGIN
CALL p_not_exists ( );
END|
DELIMITER ;|
--echo # should not return valgrind warnings
--error ER_SP_DOES_NOT_EXIST
CALL p3 ( f2 () );
DROP SCHEMA testdb;
CREATE SCHEMA testdb;
USE testdb;
DELIMITER |;
CREATE FUNCTION f2 () RETURNS INTEGER
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' SET @aux = 1;
RETURN f_not_exists () ;
END|
CREATE PROCEDURE p3 ( arg2 INTEGER )
BEGIN
CALL p_not_exists ( );
END|
DELIMITER ;|
--echo # should not return valgrind warnings
--error ER_SP_DOES_NOT_EXIST
CALL p3 ( f2 () );
DROP SCHEMA testdb;
CREATE SCHEMA testdb;
USE testdb;
DELIMITER |;
CREATE FUNCTION f2 () RETURNS INTEGER
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' SET @aux = 1;
RETURN f_not_exists () ;
END|
DELIMITER ;|
--echo # should not return valgrind warnings
SELECT f2 ();
DROP SCHEMA testdb;
--echo End of 5.1 tests