0026400: Wrong STeP file crashes OC

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Date Submitted

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0026400

Community

[OCCT] OCCT:Data Exchange

public

2015-07-04 20:57

2015-07-10 12:46

Reporter

ventu

Assigned To

gka

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

[OCCT] 6.8.0

Target Version

Fixed in Version

Summary

0026400: Wrong STeP file crashes OC

Description

Importing a STeP file with "REPRESENTATION_ITEM()" in it crashes the program.
AFAICT REPRESENTATION_ITEM should have a NAME parameter, so the file is wrong.
Still I think it could easily be imported (or at least gracefully rejected).

What happens is that the following line (RWStepGeom_RWBSplineCurveWithKnotsAndRationalBSplineCurve.cxx:228):
if (!data->CheckNbParams(num,1,ach,"representation_item")) return;
finds an incorrect number of parameters and returns immediately.
So ent->Init is not called; the entity is thus invalid, but still translated later.
The crash happens in StepGeom_BSplineCurve::Degree() which is called on a null reference from StepToGeom_MakeBSplineCurve::Convert while handling the invalid entity.

Maybe it would be possible to set aName to an emtpy string in RWStepGeom_RWBSplineCurveWithKnotsAndRationalBSplineCurve.cxx, when such a parameter is missing?

Issue History
Date Modified	Username	Field	Change
2015-07-04 20:57	ventu	New Issue
2015-07-04 20:57	ventu	Assigned To	=> gka
2015-07-10 12:05	ventu	File Added: sample.zip

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