Access violation on UDF crashes server
---------------------------------------
Key: CORE-5234
URL: http://tracker.firebirdsql.org/browse/CORE-5234
Project: Firebird Core
Issue Type: Bug
Components: UDF
Affects Versions: 3.0.0
Environment: Windows 7 x64 Professional, Firebird 3.0 x86
Reporter: Beto Neto
Priority: Blocker
I have a UDF named jjwudf. Inside it we have this exported function:
procedure udf_StrOfChr(Ret, Ch: PChar; var Count: integer); cdecl; export;
var
I: integer;
begin
if (Ch^ = #0) or (Count <= 0) then
Ret^ := #0
else begin
for I := 1 to Count do begin
Ret^ := Ch^;
Inc(Ret);
end;
Ret^ := #0;
end;
end;
And this is its DDL
DECLARE EXTERNAL FUNCTION UDF_STROFCHAR
CSTRING(254),
CSTRING(1),
INTEGER
RETURNS PARAMETER 1
ENTRY_POINT 'udf_StrOfChr' MODULE_NAME 'jjwudf';
It returns a string of the char repeated, see a usage example:
select udf_StrOfChr('a', 3) from rdb$database
Returns "aaa"
When I use it on 2.x Firebird Servers, it works! But on Firebird 3.0 it crashes
the server.
firebird.log
myvm Mon May 09 11:33:01 2016
The user defined function: UDF_STROFCHAR
referencing entrypoint: udf_StrOfChr
in module: jjwudf
caused the fatal exception: 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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