From 17ce5a9b90ea641cf433857664ee6702b4152539 Mon Sep 17 00:00:00 2001
From: "Pedro F. Giffuni" <pfg@FreeBSD.org>
Date: Wed, 8 Jun 2016 19:24:48 +0000
Subject: [PATCH] one-true-awk: Avoid a NULL dereference.

CID:		270862
Obtained from:	NetBSD (CVS Rev. 1.8)
MFC after:	2 weeks
---
 contrib/one-true-awk/tran.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contrib/one-true-awk/tran.c b/contrib/one-true-awk/tran.c
index e364ebd81928..237295af0611 100644
--- a/contrib/one-true-awk/tran.c
+++ b/contrib/one-true-awk/tran.c
@@ -333,7 +333,7 @@ char *setsval(Cell *vp, const char *s)	/* set string val of a Cell */
 		donefld = 0;	/* mark $1... invalid */
 		donerec = 1;
 	}
-	t = tostring(s);	/* in case it's self-assign */
+	t = s ? tostring(s) : tostring("");	/* in case it's self-assign */
 	if (freeable(vp))
 		xfree(vp->sval);
 	vp->tval &= ~NUM;