From 6530d37d7f3f6d00527a71ba8a02c536c28b5d9f Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Sun, 27 Dec 2009 09:22:43 -0800
Subject: troff: avoid crash if home == NULL

R=rsc
http://codereview.appspot.com/181070
---
 src/cmd/troff/dwbinit.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/cmd/troff')

diff --git a/src/cmd/troff/dwbinit.c b/src/cmd/troff/dwbinit.c
index 9c1845b0..064a0b02 100644
--- a/src/cmd/troff/dwbinit.c
+++ b/src/cmd/troff/dwbinit.c
@@ -189,7 +189,8 @@ char *DWBhome(void)
 	    if ( (home = DWBHOME) == NULL || *home == '\0' || *home == ' ' )
 		home = NULL;
 	}   /* End if */
-	home = unsharp(home);
+	if ( home != NULL )
+	    home = unsharp(home);
     }	/* End if */
 
     while (home && *home == '/' && *(home +1) == '/')	/* remove extra slashes */
-- 
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