Received: (qmail 97923 invoked by uid 501); 8 Nov 2001 16:38:04 -0000
Message-Id: <20011108163804.97922.qmail@apache.org>
Date: 8 Nov 2001 16:38:04 -0000
From: Chris Bunio <cbunio@ceridian.ca>
Reply-To: cbunio@ceridian.ca
To: submit@bugz.apache.org
Subject: Error in WriteClient support function for ISAPI Extensions
X-Send-Pr-Version: 3.110

>Number:         8715
>Category:       mod_isapi
>Synopsis:       Error in WriteClient support function for ISAPI Extensions
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Thu Nov 08 08:40:00 PST 2001
>Closed-Date:    Thu Nov 08 09:02:45 PST 2001
>Last-Modified:  Thu Nov 08 09:02:45 PST 2001
>Originator:     cbunio@ceridian.ca
>Release:        2.0.16
>Organization:
>Environment:
Windows 2000 SP2
Visual C++ 6 SP5
>Description:
When using an ISAPI extension an Access Violation is generated which is traceable back to the following code:

    bb = apr_brigade_create(r->pool);
    b = apr_bucket_transient_create(Buffer, (apr_size_t)lpwdwBytes);
    APR_BRIGADE_INSERT_TAIL(bb, b);
    b = apr_bucket_eos_create();
    APR_BRIGADE_INSERT_TAIL(bb, b);
    ap_pass_brigade(r->output_filters, bb);

The lpwdwBytes parameter that is used in the apr_bucket_transient_create function is a pointer and needs to be dereferenced before casting to the apr_size_t type.
>How-To-Repeat:
Use the simple.dll ISAPI extension that is part of the Microsoft Platform SDK samples for IIS.
>Fix:
The problem can be with the following modification to the WriteClient function:

    b = apr_bucket_transient_create(Buffer, (apr_size_t)(*lpwdwBytes));
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open-closed
State-Changed-By: jwoolley
State-Changed-When: Thu Nov  8 09:02:45 PST 2001
State-Changed-Why:
This was fixed in version 2.0.18.  Thanks for the report!
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