From b88744905a46be44ffa3c57d46080f601ae832b8 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Thu, 2 Jul 2020 20:48:16 +0200
Subject: PR fortran/93423 - ICE on invalid with argument list for module
 procedure

When recovering from an error, a NULL pointer dereference could occur.
Check for that situation and punt.

gcc/fortran/
	PR fortran/93423
	* resolve.c (resolve_symbol): Avoid NULL pointer dereference.
---
 gcc/fortran/resolve.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index 1952b53..5cc9f72 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -15918,7 +15918,7 @@ resolve_symbol (gfc_symbol *sym)
       if (formal)
 	{
 	  sym->formal_ns = formal->sym->ns;
-          if (sym->ns != formal->sym->ns)
+	  if (sym->formal_ns && sym->ns != formal->sym->ns)
 	    sym->formal_ns->refs++;
 	}
     }
-- 
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