From abe4cfb72aae79bc01f624c9b75e5e2c048e17be Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Tue, 1 Sep 2020 15:14:13 +0000
Subject: pw: Fix terminal handling when setting a group password.

Reported by:	Coverity
MFC after:	1 week
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
---
 pw/pw_group.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/pw/pw_group.c b/pw/pw_group.c
index dd65062..a294d4e 100644
--- a/pw/pw_group.c
+++ b/pw/pw_group.c
@@ -66,13 +66,18 @@ grp_set_passwd(struct group *grp, bool update, int fd, bool precrypted)
 	}
 	
 	if ((istty = isatty(fd))) {
-		n = t;
-		/* Disable echo */
-		n.c_lflag &= ~(ECHO);
-		tcsetattr(fd, TCSANOW, &n);
-		printf("%sassword for group %s:", update ? "New p" : "P",
-		    grp->gr_name);
-		fflush(stdout);
+		if (tcgetattr(fd, &t) == -1)
+			istty = 0;
+		else {
+			n = t;
+			/* Disable echo */
+			n.c_lflag &= ~(ECHO);
+			tcsetattr(fd, TCSANOW, &n);
+			printf("%sassword for group %s:",
+			    update ? "New p" : "P",
+			    grp->gr_name);
+			fflush(stdout);
+		}
 	}
 	b = read(fd, line, sizeof(line) - 1);
 	if (istty) {	/* Restore state */
-- 
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