From 079375d12b46e5ced7ac96618f4a6a0c13055eae Mon Sep 17 00:00:00 2001
From: Conrad Meyer <cem@FreeBSD.org>
Date: Thu, 12 May 2016 03:44:29 +0000
Subject: [PATCH] kern_descrip_test: Fix trivial buffer overrun with
 readlink(2)

Reported by:	Coverity
CID:		1229965, 1229972
Sponsored by:	EMC / Isilon Storage Division
---
 tests/sys/kern/kern_descrip_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/sys/kern/kern_descrip_test.c b/tests/sys/kern/kern_descrip_test.c
index 6953b00fc6f2..07240d75b900 100644
--- a/tests/sys/kern/kern_descrip_test.c
+++ b/tests/sys/kern/kern_descrip_test.c
@@ -27,6 +27,7 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include <sys/param.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
@@ -170,7 +171,7 @@ ATF_TC_CLEANUP(kern_maxfiles__increase, tc)
 	char buf[80];
 
 	if ((n = readlink(VALUE, buf, sizeof(buf))) > 0) {
-		buf[n] = '\0';
+		buf[MIN((size_t)n, sizeof(buf) - 1)] = '\0';
 		if (sscanf(buf, "%d", &oldmaxfiles) == 1) {
 			oldlen = sizeof(oldmaxfiles);
 			(void) sysctlbyname("kern.maxfiles", NULL, 0,