Alter function result type and run query can cause server to crash
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Key: CORE-5849
URL: http://tracker.firebirdsql.org/browse/CORE-5849
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0.4
Environment: WI-V3.0.4.32954 Firebird 3.0
Reporter: Karol Bieniaszewski
Priority: Critical
SET TERM ^ ;
CREATE FUNCTION FUN2(A CHAR(8), B CHAR(4), C CHAR(12)) RETURNS CHAR(2)
AS
DECLARE VARIABLE VAR_RESULT VARCHAR(50);
BEGIN
VAR_RESULT = A || B || C;
IF (char_length(VAR_RESULT)=20) then
VAR_RESULT = '21312321';
RETURN VAR_RESULT;
END^
SET TERM ; ^
SET TERM ^ ;
CREATE FUNCTION FUN1(A CHAR(8), B CHAR(4), C CHAR(12)) RETURNS CHAR(26)
AS
BEGIN
RETURN FUN2(A, B, C) || A || B || C;
END^
SET TERM ; ^
------------------------------------------------------------------------------------------
run the query:
SELECT FUN1('1020', '2080', '000625180347'), FUN2('1020', '2080',
'000625180347') FROM RDB$DATABASE
commit;
------------------------------------------------------------------------------------------
alter result type
SET TERM ^ ;
ALTER FUNCTION FUN2(A CHAR(8), B CHAR(4), C CHAR(12)) RETURNS CHAR(50)
AS
DECLARE VARIABLE VAR_RESULT VARCHAR(50);
BEGIN
VAR_RESULT = A || B || C;
IF (char_length(VAR_RESULT)=20) then
VAR_RESULT = '21312321';
RETURN VAR_RESULT;
END^
SET TERM ; ^
------------------------------------------------------------------------------------------
run the query:
SELECT FUN1('1020', '2080', '000625180347'), FUN2('1020', '2080',
'000625180347') FROM RDB$DATABASE
------------------------------------------------------------------------------------------
error reading data from the connection...
FIREBIRDDEV Wed Jun 20 09:52:34 2018
Access violation.
The code attempted to access a virtual
address without privilege to do so.
This exception will cause the Firebird server
to terminate abnormally.
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