From bcbaf9fd4720d0d9caaef7f6b072cacbd7911407 Mon Sep 17 00:00:00 2001
From: Conrad Meyer <cem@FreeBSD.org>
Date: Fri, 14 Apr 2017 00:22:28 +0000
Subject: [PATCH] fsck(8): Don't overrun mount device buffer

Apply a very similar fix to r299460 (fsck_ffs) to apparently duplicated code
in fsck.

Reported by:	Coverity
CID:		1006789
Sponsored by:	Dell EMC Isilon
---
 sbin/fsck/fsutil.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sbin/fsck/fsutil.c b/sbin/fsck/fsutil.c
index 935992e9bda..348b288ed21 100644
--- a/sbin/fsck/fsutil.c
+++ b/sbin/fsck/fsutil.c
@@ -172,6 +172,9 @@ getmntpt(const char *name)
 		statfsp = &mntbuf[i];
 		dev_name = statfsp->f_mntfromname;
 		if (*dev_name != '/') {
+			if (strlen(_PATH_DEV) + strlen(dev_name) + 1 >
+			    sizeof(statfsp->f_mntfromname))
+				continue;
 			strcpy(device, _PATH_DEV);
 			strcat(device, dev_name);
 			strcpy(statfsp->f_mntfromname, device);