0031349: Modeling Data - GC_MakeSegment causes reading from NULL when start point and end point are identical

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0031349

Community

[OCCT] OCCT:Modeling Data

public

2020-02-05 14:43

2020-09-15 12:13

Reporter

taoyouh

Assigned To

msv

Priority

normal

Severity

just a question

Status

new

Resolution

open

Platform

VC++ 2019 64 bit

Windows

OS Version

Product Version

[OCCT] 6.3.1

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0031349: Modeling Data - GC_MakeSegment causes reading from NULL when start point and end point are identical

Description

In OCCT 7.4.0, when start point and end point are identical, the constructor of GC_MakeSegment tries to read at address NULL and causes an access violation.

Steps To Reproduce

pload MODELING
point p0 0 0 0
point p1 1 0 0
gcarc s1 seg p0 p1 # OK
gcarc s0 seg p0 p0 # KO

** Exception ** 000002A848257B20 : StdFail_NotDone: GC_MakeLine::Value() - no result

Compile and run the following code:
gp_Pnt ps;
GC_MakeSegment make_segment(ps, ps);

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Notes
(0090809) kgv (developer) 2020-03-04 12:11	The current design of GC tools is throwing an exception only in Debug builds - so that it is expected that application will NEVER pass invalid input to these tools (e.g. pre-validate input): StdFail_NotDone_Raise_if (TheError != gce_Done, "GC_MakeArcOfHyperbola::Value() - no result"); So the current behavior - is by design. It might be reconsidered to throw exception in Release builds (shouldn't harm performance, I think).

Issue History
Date Modified	Username	Field	Change
2020-02-05 14:43	taoyouh	New Issue
2020-02-05 14:43	taoyouh	Assigned To	=> msv
2020-03-04 12:01	kgv	Summary	GC_MakeSegment causes reading from NULL when start point and end point are identical => Modeling Data - GC_MakeSegment causes reading from NULL when start point and end point are identical
2020-03-04 12:07	kgv	Steps to Reproduce Updated	View Revisions
2020-03-04 12:11	kgv	Note Added: 0090809
2020-03-04 12:13	kgv	Severity	crash => just a question
2020-03-04 12:13	kgv	Product Version	=> 6.3.1
2020-03-04 12:13	kgv	Target Version	=> 7.5.0
2020-09-15 12:13	msv	Target Version	7.5.0 => 7.6.0*