ChFi3d_KParticular stack-use-after-scope

Running OCC with the llvm sanitizer I get the following error:

=================================================================
==601==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7ffd16140748 at pc 0x7f51f34051b4 bp 0x7ffd161405f0 sp 0x7ffd161405e8
READ of size 8 at 0x7ffd16140748 thread T0
    #0 0x7f51f34051b3 in gp_XYZ::Dot(gp_XYZ const&) const opencascade-7.3/src/gp/gp_XYZ.lxx:160
    #0000001 0x7f51f34051b3 in gp_Dir::Angle(gp_Dir const&) const opencascade-7.3/src/gp/gp_Dir.cxx:36
    #0000002 0x7f51eef658b3 in gp_Dir::IsParallel(gp_Dir const&, double) const opencascade-7.3/src/gp/gp_Dir.lxx:175
    #3 0x7f51eef658b3 in ChFi3d_KParticular(opencascade::handle<ChFiDS_Spine> const&, int, BRepAdaptor_Surface const&, BRepAdaptor_Surface const&) opencascade-7.3/src/ChFi3d/ChFi3d_Builder_0.cxx:547
    #4 0x7f51eefd9c32 in ChFi3d_Builder::PerformSetOfKPart(opencascade::handle<ChFiDS_Stripe>&, bool) opencascade-7.3/src/ChFi3d/ChFi3d_Builder_2.cxx:2342
    #5 0x7f51ef0002fd in ChFi3d_Builder::PerformSetOfSurf(opencascade::handle<ChFiDS_Stripe>&, bool) opencascade-7.3/src/ChFi3d/ChFi3d_Builder_2.cxx:2968
    #6 0x7f51eef55eef in ChFi3d_Builder::Compute() opencascade-7.3/src/ChFi3d/ChFi3d_Builder.cxx:264
    #0000007 0x7f51ef4732ec in BRepFilletAPI_MakeChamfer::Build() opencascade-7.3/src/BRepFilletAPI/BRepFilletAPI_MakeChamfer.cxx:389

The problem is on line 547 of ChFi3d_Builder_0.cxx:

const gp_Dir& aD1=aS1.Plane().Axis().Direction();

Here, aS1.Plane(), which is,

gp_Pln BRepAdaptor_Surface::Plane()const
{
  return mySurf.Plane().Transformed(myTrsf);
}

returns a temporary object of the type gp_Pln. As a result const gp_Dir& aD1 references a temporary object. The functions calls to aS2.Cylinder() and aS2.Cone() have the same problem in ChFi3d_KParticular.

The following patch resolves the issue:

Index: src/ChFi3d/ChFi3d_Builder_0.cxx
===================================================================
--- src/ChFi3d/ChFi3d_Builder_0.cxx (revision 1)
+++ src/ChFi3d/ChFi3d_Builder_0.cxx (working copy)
@@ -538,8 +538,8 @@
     }
   }
   else if (aST2==GeomAbs_Cylinder) {
- const gp_Dir& aD1=aS1.Plane().Axis().Direction();
- const gp_Dir& aD2=aS2.Cylinder().Axis().Direction();
+ const gp_Dir aD1=aS1.Plane().Axis().Direction();
+ const gp_Dir aD2=aS2.Cylinder().Axis().Direction();
     //
     if (aCT==GeomAbs_Line && aD1.IsNormal(aD2, aPA)) {
       return bRet;
@@ -549,8 +549,8 @@
     }
   }
   else if(aST2==GeomAbs_Cone) {
- const gp_Dir& aD1=aS1.Plane().Axis().Direction();
- const gp_Dir& aD2=aS2.Cone().Axis().Direction();
+ const gp_Dir aD1=aS1.Plane().Axis().Direction();
+ const gp_Dir aD2=aS2.Cone().Axis().Direction();
     if (aCT == GeomAbs_Circle && aD1.IsParallel(aD2, aPA)) {
       return bRet;
     }