From 58140e3cf97aedc5c9f3b3e6519027334cdc3213 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Mon, 29 Nov 2021 22:23:02 +0100
Subject: [PATCH] Fortran: check type of SUB argument to IMAGE_INDEX

gcc/fortran/ChangeLog:

	PR fortran/101565
	* check.c (gfc_check_image_index): Verify that SUB argument to
	IMAGE_INDEX is of type integer.

gcc/testsuite/ChangeLog:

	PR fortran/101565
	* gfortran.dg/coarray_49.f90: New test.
---
 gcc/fortran/check.c                      | 7 +++++++
 gcc/testsuite/gfortran.dg/coarray_49.f90 | 9 +++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/coarray_49.f90

diff --git a/gcc/fortran/check.c b/gcc/fortran/check.c
index 3e65f3d8b1f..ee3a51ee253 100644
--- a/gcc/fortran/check.c
+++ b/gcc/fortran/check.c
@@ -5955,6 +5955,13 @@ gfc_check_image_index (gfc_expr *coarray, gfc_expr *sub)
       return false;
     }

+  if (sub->ts.type != BT_INTEGER)
+    {
+      gfc_error ("Type of %s argument of IMAGE_INDEX at %L shall be INTEGER",
+		 gfc_current_intrinsic_arg[1]->name, &sub->where);
+      return false;
+    }
+
   if (gfc_array_size (sub, &nelems))
     {
       int corank = gfc_get_corank (coarray);
diff --git a/gcc/testsuite/gfortran.dg/coarray_49.f90 b/gcc/testsuite/gfortran.dg/coarray_49.f90
new file mode 100644
index 00000000000..370e3fd5847
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/coarray_49.f90
@@ -0,0 +1,9 @@
+! { dg-do compile }
+! { dg-options "-fcoarray=lib" }
+! PR fortran/101565 - ICE in gfc_simplify_image_index
+! Contributed by G. Steinmetz
+
+program p
+  integer :: x[*]
+  print *, image_index (x, [1.0]) ! { dg-error "shall be INTEGER" }
+end
--
2.26.2