[gcc r13-330] Fortran: fix error recovery on invalid array section

[gcc r13-330] Fortran: fix error recovery on invalid array section

[Harald Anlauf]

https://gcc.gnu.org/g:0acdbe29f66017fc5cca40dcbd72a0dd41491d07

commit r13-330-g0acdbe29f66017fc5cca40dcbd72a0dd41491d07
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Tue May 10 23:41:57 2022 +0200

    Fortran: fix error recovery on invalid array section
    
    gcc/fortran/ChangeLog:
    
            PR fortran/105230
            * expr.cc (find_array_section): Correct logic to avoid NULL
            pointer dereference on invalid array section.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/105230
            * gfortran.dg/pr105230.f90: New test.
    
    Co-authored-by: Steven G. Kargl <kargl@gcc.gnu.org>

Diff:
---
 gcc/fortran/expr.cc                    | 4 ++--
 gcc/testsuite/gfortran.dg/pr105230.f90 | 8 ++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/gcc/fortran/expr.cc b/gcc/fortran/expr.cc
index 86d61fed302..be94c18c836 100644
--- a/gcc/fortran/expr.cc
+++ b/gcc/fortran/expr.cc
@@ -1595,8 +1595,8 @@ find_array_section (gfc_expr *expr, gfc_ref *ref)
 	  if ((begin && begin->expr_type != EXPR_CONSTANT)
 	      || (finish && finish->expr_type != EXPR_CONSTANT)
 	      || (step && step->expr_type != EXPR_CONSTANT)
-	      || (!begin && !lower)
-	      || (!finish && !upper))
+	      || !lower
+	      || !upper)
 	    {
 	      t = false;
 	      goto cleanup;
diff --git a/gcc/testsuite/gfortran.dg/pr105230.f90 b/gcc/testsuite/gfortran.dg/pr105230.f90
new file mode 100644
index 00000000000..6c6b42ef9bf
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr105230.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! PR fortran/105230 - ICE in find_array_section
+! Contributed by G.Steinmetz
+
+program p
+  integer, parameter :: a(:) = [1, 2] ! { dg-error "deferred shape" }
+  print *, reshape([3, 4], a(1:2))
+end