AcquireFileForNtCreateSection fall down go BOOM!

NTFSD
1

Upon a rare occasion my driver is crashing with bugcheck 1E in the hander for
AcquireFileForNtCreateSection. It is crashing on this check:

deviceObject = FileObject->DeviceObject->Vpb->DeviceObject

(it seems like the Vpb pointer is either null or bad). This shouldn’t be,
should it? Sfilter does not make a check for a valid pointer. Am I missing
something?

Thanks for any tips.

Neil

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2

Which file system is it for? Not all file systems have VPB (in fact, only
media file systems have a VPB) so it IS acceptable for this field to be
NULL.

Wouldn’t it be better to code this as:

deviceObject = FileObject->DeviceObject->Vpb ?
FileObject->DeviceObject->Vpb->DeviceObject : FileObject->DeviceObject;

This ensures you get the FSD device object whether it is a physical file
system or some other type of file system.

Regards,

Tony Mason
Consulting Partner
OSR Open Systems Resources, Inc.
http://www.osr.com

-----Original Message-----
From: Neil Weicher [mailto:xxxxx@netlib.com]
Sent: Friday, December 15, 2000 10:03 PM
To: File Systems Developers
Subject: [ntfsd] AcquireFileForNtCreateSection fall down go BOOM!

Upon a rare occasion my driver is crashing with bugcheck 1E in the hander
for
AcquireFileForNtCreateSection. It is crashing on this check:

deviceObject = FileObject->DeviceObject->Vpb->DeviceObject

(it seems like the Vpb pointer is either null or bad). This shouldn’t be,
should it? Sfilter does not make a check for a valid pointer. Am I missing
something?

Thanks for any tips.

Neil

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