From 7ac7b0437a81a404993bb6e73426efaea8e9b6d9 Mon Sep 17 00:00:00 2001
From: mpf <mpf@openbsd.org>
Date: Wed, 20 Aug 2008 09:22:02 +0000
Subject: [PATCH] Use and report errors that inflate(3) can return, instead of
 aborting silently, and pretending everything went alright. This lets gzip(1)
 (especially gzip -t) detect truncated archives and curruptions that violate
 the structure of the zlib format. Unquiet compress(1) in zless/zmore, so the
 user has a chance to see errors on corrupted archives. OK millert@, markus@

---
 usr.bin/compress/gzopen.c | 13 +++++++++++--
 usr.bin/compress/zmore    |  6 +++---
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/usr.bin/compress/gzopen.c b/usr.bin/compress/gzopen.c
index 2e6d704c301..14c48595602 100644
--- a/usr.bin/compress/gzopen.c
+++ b/usr.bin/compress/gzopen.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: gzopen.c,v 1.24 2007/03/19 13:02:18 pedro Exp $	*/
+/*	$OpenBSD: gzopen.c,v 1.25 2008/08/20 09:22:02 mpf Exp $	*/
 
 /*
  * Copyright (c) 1997 Michael Shalayeff
@@ -60,7 +60,7 @@
 
 #ifndef SMALL
 const char gz_rcsid[] =
-    "$OpenBSD: gzopen.c,v 1.24 2007/03/19 13:02:18 pedro Exp $";
+    "$OpenBSD: gzopen.c,v 1.25 2008/08/20 09:22:02 mpf Exp $";
 #endif
 
 #include <sys/param.h>
@@ -439,6 +439,15 @@ gz_read(void *cookie, char *buf, int len)
 		}
 
 		error = inflate(&(s->z_stream), Z_NO_FLUSH);
+
+		if (error == Z_DATA_ERROR) {
+			errno = EINVAL;
+			return -1;
+		}
+		if (error == Z_BUF_ERROR) {
+			errno = EIO;
+			return -1;
+		}
 		if (error == Z_STREAM_END) {
 			/* Check CRC and original size */
 			s->z_crc = crc32(s->z_crc, start,
diff --git a/usr.bin/compress/zmore b/usr.bin/compress/zmore
index 93378fcc712..98522ef9da6 100644
--- a/usr.bin/compress/zmore
+++ b/usr.bin/compress/zmore
@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-# $OpenBSD: zmore,v 1.5 2007/05/20 00:27:27 jsg Exp $
+# $OpenBSD: zmore,v 1.6 2008/08/20 09:22:02 mpf Exp $
 #
 # Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
 #
@@ -47,13 +47,13 @@ fi
 
 # No files means read from stdin
 if [ $# -eq 0 ]; then
-	compress -cdfq 2>&1 | $pager $flags
+	compress -cdf 2>&1 | $pager $flags
 	exit 0
 fi
 
 oterm=`stty -g 2>/dev/null`
 while test $# -ne 0; do
-	compress -cdfq "$1" 2>&1 | $pager $flags
+	compress -cdf "$1" 2>&1 | $pager $flags
 	prev="$1"
 	shift
 	if tty -s && test -n "$oterm" -a $# -gt 0; then
-- 
2.20.1