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Serious

Reported By: Raul Sinimae
Reported On: 5/19/2022
For: Version 4.50 Build 2

# 4886 DBISAM Incorrectly Using 32-bit Integer Type for File Handles on Windows

Looking at DBISAM source code it looks to me it uses "integer" for storing what looks like THandles - did a quick search and for example "OSFileCreate" function in "dbisamlb" calls CreateFileA which returns THandle.

We did have a weird crash with our logging library (which uses RegisterEventSource/DeregisterEventSource Win API calls) - it was using integer and after changing it to thandle have not had any more issues.

Have not investigated this much further yet but I think there might be a need a to convert lot of Integer code to use THandle type or one can run into some random crashes and access violations potentially

Comments

There wasn't any evidence that this was actually a problem, but it definitely has the potential to become problematic if the handle values ever exceeded the 32-bit, signed integer range.

Resolution

Fixed Problem on 6/25/2022 in version 4.50 build 3

Products Affected

DBISAM Additional Software and Utilities
DBISAM ODBC Client-Server
DBISAM ODBC Client-Server with Source
DBISAM ODBC Standard
DBISAM ODBC Standard with Source
DBISAM ODBC Trial
DBISAM VCL Client-Server
DBISAM VCL Client-Server with Source
DBISAM VCL Standard
DBISAM VCL Standard with Source
DBISAM VCL Trial

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