Fortran: error recovery after reference to bad CLASS variable [PR107681]

gcc/fortran/ChangeLog:

	PR fortran/107681
	* resolve.cc (resolve_fl_var_and_proc): Prevent NULL pointer
	dereference with reference to bad CLASS variable.

gcc/testsuite/ChangeLog:

	PR fortran/107681
	* gfortran.dg/pr107681.f90: New test.

diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index 5ff1cd070ac14a1eb4ffd91f91f92a1898bdc388..24e5aa03556d9977b10171d69157412e1fbd2edb 100644 (file)
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc
@@ -12967,6 +12967,7 @@ resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
          && sym->ts.u.derived
          && !sym->attr.select_type_temporary
          && !UNLIMITED_POLY (sym)
+         && CLASS_DATA (sym)->ts.u.derived
          && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
        {
          gfc_error ("Type %qs of CLASS variable %qs at %L is not extensible",

diff --git a/gcc/testsuite/gfortran.dg/pr107681.f90 b/gcc/testsuite/gfortran.dg/pr107681.f90
new file mode 100644 (file)
index 0000000..0999ad9
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr107681.f90
@@ -0,0 +1,13 @@
+! { dg-do compile }
+! { dg-options "-fcoarray=lib" }
+! PR fortran/107681 - ICE in gfc_type_is_extensible
+! Contributed by G.Steinmetz
+
+program p
+  type t
+     integer, allocatable :: a
+  end type
+  class(t) :: x[*]   ! { dg-error "must be dummy, allocatable or pointer" }
+  associate (y => x) ! { dg-error "Invalid array reference" }
+  end associate
+end