0030201: ChFi3d_Builder::PerformMoreThreeCorner segfault by using nullptr

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Date Submitted

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0030201

Community

[OCCT] OCCT:Modeling Algorithms

public

2018-10-04 19:01

2019-01-23 19:15

Reporter

galbramc

Assigned To

jgv

Priority

normal

Severity

crash

Status

assigned

Resolution

open

Platform

OS Version

Product Version

[OCCT] 7.3.0

Target Version

[OCCT] 7.4.0*

Fixed in Version

Summary

0030201: ChFi3d_Builder::PerformMoreThreeCorner segfault by using nullptr

Description

BRep_Tool::CurveOnSurface on lines 2225 and 2235 can set curv2d1 or curv2d2 to null. These variables are then used without checking for the null value leading to a segfault. Throwing an exception in the following patch is a band aid that avoids the segfault, but does not resolve the desire for a fillet.

Index: src/ChFi3d/ChFi3d_Builder_CnCrn.cxx
===================================================================
--- src/ChFi3d/ChFi3d_Builder_CnCrn.cxx (revision 1)
+++ src/ChFi3d/ChFi3d_Builder_CnCrn.cxx (working copy)
@@ -2226,6 +2226,7 @@
                                               u1bid,u2bid);
     else
       Calcul_C2dOnFace(CD.Value(ic),jf.Value(ic),i.Value(ic,icplus),curv2d1);
+ if(curv2d1.IsNull()) throw Standard_ConstructionError("PChFi3d_Builder::PerformMoreThreeCorner : curv2d1 is null");
     p2d1 = curv2d1 ->Value(p.Value(ic,icplus));

     // recuperation de la deuxieme courbe 2d
@@ -2237,6 +2238,7 @@
       jfp = 3 - jf.Value(icplus);
       Calcul_C2dOnFace(CD.Value(icplus),jfp,i.Value(icplus,ic),curv2d2);
     }
+ if(curv2d2.IsNull()) throw Standard_ConstructionError("PChFi3d_Builder::PerformMoreThreeCorner : curv2d2 is null");
     p2d2 = curv2d2 ->Value(p.Value(icplus,ic));

     Asurf = new GeomAdaptor_HSurface(BRep_Tool::Surface(TopoDS::Face(Fvive.Value(ic,icplus))));

Steps To Reproduce

Run attached code with shape.brep.

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Test case number

Attached Files

ChFi3d_nullptr.tgz (6,763 bytes) 2018-10-04 19:01

Relationships

Notes
(0081867) galbramc (reporter) 2019-01-23 16:23	Any luck with getting this use of a null pointer resolved?

Issue History
Date Modified	Username	Field	Change
2018-10-04 19:01	galbramc	New Issue
2018-10-04 19:01	galbramc	Assigned To	=> msv
2018-10-04 19:01	galbramc	File Added: ChFi3d_nullptr.tgz
2018-10-12 20:41	abv	Target Version	=> 7.4.0*
2018-10-15 10:15	msv	Assigned To	msv => jgv
2018-10-15 10:15	msv	Status	new => assigned
2019-01-23 16:23	galbramc	Note Added: 0081867