[Bug fortran/99147] New: Sanitizer detects heap-use-after-free in gfc_add_flavor

[zeccav at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99147

            Bug ID: 99147
           Summary: Sanitizer detects heap-use-after-free in
                    gfc_add_flavor
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zeccav at gmail dot com
  Target Milestone: ---

! trunk 150221 gfortran -fdec
! ERROR: AddressSanitizer: heap-use-after-free
! READ of size 1 at 0x613000001f18 thread T0
!    #0 0xe1a258 in gfc_add_flavor(symbol_attribute*, sym_flavor, char const*,
locus*) ../../gcc/gcc/fortran/symbol.c:1775
! symbol.c:1775 "if (gfc_new_block && gfc_new_block->abr_modproc_decl"
      TYPE :: t
      END TYPE
      END