From c12cd325b0c1e5bcd4411384c65567a7590d42f8 Mon Sep 17 00:00:00 2001
From: millert <millert@openbsd.org>
Date: Mon, 1 Nov 2021 18:28:24 +0000
Subject: [PATCH] awkgetline: do not access unitialized data on EOF getrec()
 returns 0 on EOF and leaves the contents of buf unchanged. From
 https://github.com/onetrueawk/awk/pull/134

---
 usr.bin/awk/run.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/usr.bin/awk/run.c b/usr.bin/awk/run.c
index d7570bcb31f..128a7eaead6 100644
--- a/usr.bin/awk/run.c
+++ b/usr.bin/awk/run.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: run.c,v 1.69 2020/12/09 20:00:11 millert Exp $	*/
+/*	$OpenBSD: run.c,v 1.70 2021/11/01 18:28:24 millert Exp $	*/
 /****************************************************************
 Copyright (C) Lucent Technologies 1997
 All Rights Reserved
@@ -448,13 +448,15 @@ Cell *awkgetline(Node **a, int n)	/* get next line from specific input */
 			n = getrec(&record, &recsize, true);
 		else {			/* getline var */
 			n = getrec(&buf, &bufsize, false);
-			x = execute(a[0]);
-			setsval(x, buf);
-			if (is_number(x->sval, & result)) {
-				x->fval = result;
-				x->tval |= NUM;
+			if (n > 0) {
+				x = execute(a[0]);
+				setsval(x, buf);
+				if (is_number(x->sval, & result)) {
+					x->fval = result;
+					x->tval |= NUM;
+				}
+				tempfree(x);
 			}
-			tempfree(x);
 		}
 	}
 	setfval(r, (Awkfloat) n);
-- 
2.20.1