From 650150389770a309b31953f2c8c02f3e0f24f65b Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Tue, 5 Jan 2016 15:32:09 -0800
Subject: [PATCH] PDP11, VAX: Fix potential NULL pointer dereference in
 autoconfigure.

No existing simulators have device combinations that would expose this.
It is merely the right thing to do.
---
 PDP11/pdp11_io_lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PDP11/pdp11_io_lib.c b/PDP11/pdp11_io_lib.c
index 5f53f188..98d444d1 100644
--- a/PDP11/pdp11_io_lib.c
+++ b/PDP11/pdp11_io_lib.c
@@ -884,7 +884,7 @@ for (autp = auto_tab; autp->numc >= 0; autp++) {        /* loop thru table */
         for (k=jdis=0; k<j; k++) {
             DEVICE *kdptr = find_dev (autp->dnam[k]);
             
-            if (kdptr->flags & DEV_DIS)
+            if ((kdptr == NULL) || (kdptr->flags & DEV_DIS))
                 ++jdis;
             }
         if (autp->fixa[j-jdis])                         /* fixed csr avail? */