From: cheloha <cheloha@openbsd.org>
Date: Sat, 4 Mar 2023 00:00:25 +0000 (+0000)
Subject: tee(1): explicitly check read(2) return value for 0 and -1
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=ce7941a337ad1e5d1c771daff1e3106f1cdf6e5d;p=openbsd

tee(1): explicitly check read(2) return value for 0 and -1
---

diff --git a/usr.bin/tee/tee.c b/usr.bin/tee/tee.c
index 0ead1771d19..e7e6fcf680f 100644
--- a/usr.bin/tee/tee.c
+++ b/usr.bin/tee/tee.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tee.c,v 1.14 2021/12/13 18:33:23 cheloha Exp $	*/
+/*	$OpenBSD: tee.c,v 1.15 2023/03/04 00:00:25 cheloha Exp $	*/
 /*	$NetBSD: tee.c,v 1.5 1994/12/09 01:43:39 jtc Exp $	*/
 
 /*
@@ -114,7 +114,7 @@ main(int argc, char *argv[])
 	buf = malloc(BSIZE);
 	if (buf == NULL)
 		err(1, NULL);
-	while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0) {
+	while ((rval = read(STDIN_FILENO, buf, BSIZE)) != 0 && rval != -1) {
 		SLIST_FOREACH(p, &head, next) {
 			for (n = 0; n < rval; n += wval) {
 				wval = write(p->fd, buf + n, rval - n);