From ca23bda1cf4a5efa579d7ecbc7b909d789992615 Mon Sep 17 00:00:00 2001
From: Peter Johnson <peter@tortall.net>
Date: Fri, 25 Apr 2008 05:07:57 +0000
Subject: [PATCH] Defensively look for NULL istk.

svn path=/trunk/yasm/; revision=2075
---
 modules/preprocs/nasm/nasm-pp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/preprocs/nasm/nasm-pp.c b/modules/preprocs/nasm/nasm-pp.c
index 604bb2bc..2bb94b04 100644
--- a/modules/preprocs/nasm/nasm-pp.c
+++ b/modules/preprocs/nasm/nasm-pp.c
@@ -4237,6 +4237,8 @@ pp_getline(void)
          * buffer or from the input file.
          */
         tline = NULL;
+        if (!istk)
+            return NULL;
         while (istk->expansion && istk->expansion->finishes)
         {
             Line *l = istk->expansion;
-- 
2.40.0