From: millert <millert@openbsd.org>
Date: Thu, 8 Jul 2021 21:26:39 +0000 (+0000)
Subject: Avoid a potential buffer overflow in backslash escaping.
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=c4bbc4f754bb807ee62751a926e6a11544136690;p=openbsd

Avoid a potential buffer overflow in backslash escaping.
https://github.com/onetrueawk/awk/issues/121
---

diff --git a/usr.bin/awk/b.c b/usr.bin/awk/b.c
index 53418e10ba5..e3c45e98094 100644
--- a/usr.bin/awk/b.c
+++ b/usr.bin/awk/b.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: b.c,v 1.36 2021/03/02 20:41:42 millert Exp $	*/
+/*	$OpenBSD: b.c,v 1.37 2021/07/08 21:26:39 millert Exp $	*/
 /****************************************************************
 Copyright (C) Lucent Technologies 1997
 All Rights Reserved
@@ -1108,7 +1108,7 @@ rescan:
 					 * program to track each string's length.
 					 */
 					for (i = 1; i <= UCHAR_MAX; i++) {
-						if (!adjbuf((char **) &buf, &bufsz, bp-buf+1, 100, (char **) &bp, "relex2"))
+						if (!adjbuf((char **) &buf, &bufsz, bp-buf+2, 100, (char **) &bp, "relex2"))
 						    FATAL("out of space for reg expr %.10s...", lastre);
 						if (cc->cc_func(i)) {
 							/* escape backslash */