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From: "phil1691 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/99711] New: Crash when reading an allocated character
 array in namelist
Date: Mon, 22 Mar 2021 14:02:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99711

            Bug ID: 99711
           Summary: Crash when reading an allocated character array in
                    namelist
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: phil1691 at gmail dot com
  Target Milestone: ---

The following code crashes with a segmentation fault (gcc 10.2.0):
> cat alloc_nml.f90=20
program allocnml
  implicit none

  character(len=3D:), dimension(:), allocatable :: cbulist_ru
  integer :: iluseg

  namelist /nam_bu_ru/ cbulist_ru

  allocate( character(len=3D10) :: cbulist_ru(5) )

  open(newunit=3Diluseg, file=3D'list.nml', status=3D'old', &
       action=3D'read', form=3D'formatted', access=3D'sequential')

  read(unit=3Diluseg, nml=3Dnam_bu_ru)

  print *, cbulist_ru

  close(unit=3Diluseg)
end program allocnml

With the following namelist file:
> cat list.nml
&NAM_BU_RU
 CBULIST_RU(1) =3D 'PRES'
 CBULIST_RU(2) =3D 'NEST'
 CBULIST_RU(3) =3D 'HTURB'
 CBULIST_RU(4) =3D 'VTURB'
/

Compilation:
> gfortran -g alloc_nml.f90

Execution:
> ./a.out=20

Program received signal SIGSEGV: Segmentation fault - invalid memory refere=
nce.

Backtrace for this error:
#0  0x146bdba3349f in ???
#1  0x146bdbb57d7a in ???
#2  0x146bdc79df4b in nml_read_obj
        at ../../../gcc-10.2.0-srcdir/libgfortran/io/list_read.c:3142
#3  0x146bdc79ee8a in nml_get_obj_data
        at ../../../gcc-10.2.0-srcdir/libgfortran/io/list_read.c:3512
#4  0x146bdc7a78b7 in finalize_transfer
        at ../../../gcc-10.2.0-srcdir/libgfortran/io/transfer.c:4128
#5  0x400d48 in allocnml
        at
/home/waup/F90/bug_gcc/character_allocatable_namelist/alloc_nml.f90:14
#6  0x400e20 in main
        at
/home/waup/F90/bug_gcc/character_allocatable_namelist/alloc_nml.f90:19
Erreur de segmentation (core dumped)=