[Paraview-developers] CGNS reader bug

[Jim.Eliot at awe.co.uk]

Good morning,

I have run into a bug with the CGNS reader in ParaView which appeared when I moved from ParaView version 4.3.1 to 4.4.0. When I try to open a CGNS file that was created with a CGNS library version that is higher than that used by ParaView (3.1.3) it fails, and if it is an hdf5-based CGNS file, it produces a segmentation fault.

I think that this might be the same problem as bug 0015704, so I updated that bug with my details. I thought that maybe I should report it here also.

I did some investigating and it seems that problem is caused by some incorrect version number checks in vtkCGNSReader.cxx.  For hdf5-based CGNS files, the segfault occurs in vtkMPASReader::CanReadFile due to a strcpy on an invalid pointer.

I have created a fix for the CGNS version checks and have attached a git diff of vtkCGNSReader.cxx to this email. This fixes the CGNS reader, and also seems to prevent the segfault in vtkMPASReader::CanReadFile as this code is no longer reached.

Regards,
Jim

Jim Eliot
High Performance Computing Group
AWE, Aldermaston, Reading, RG7 4PR



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