From 98c5b5924de969ae8ab37d140aa85bcca3f3c76c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Rui=20Faustino=20de=20Sousa?=
 <jrfsousa@gmail.com>
Date: Fri, 16 Apr 2021 16:17:21 +0000
Subject: Fortran: Fix ICE due to referencing a NULL pointer [PR100018]

gcc/fortran/ChangeLog:

	PR fortran/100018
	* resolve.c: Add association check before de-referencing pointer.

gcc/testsuite/ChangeLog:

	PR fortran/100018
	* gfortran.dg/PR10018.f90: New test.
---
 gcc/fortran/resolve.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'gcc/fortran/resolve.c')

diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index 1c9b0c5..dd4b266 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -11999,6 +11999,7 @@ start:
 	    /* Assigning a class object always is a regular assign.  */
 	    if (code->expr2->ts.type == BT_CLASS
 		&& code->expr1->ts.type == BT_CLASS
+		&& CLASS_DATA (code->expr2)
 		&& !CLASS_DATA (code->expr2)->attr.dimension
 		&& !(gfc_expr_attr (code->expr1).proc_pointer
 		     && code->expr2->expr_type == EXPR_VARIABLE
-- 
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