From 9eb5ce5ae298a13af29f2c85f33ef75773e852ee Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Tue, 24 Feb 2015 16:00:36 -0500
Subject: [PATCH] Grow.c: Fix classic readlink() buffer overflow

The buffer passed on to readlink() needs to contain space for the
terminating \0. See 'man 3 readlink' for details.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
 Grow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Grow.c b/Grow.c
index b78d063..a8bbf2b 100644
--- a/Grow.c
+++ b/Grow.c
@@ -3319,7 +3319,7 @@ started:
 		bul = make_backup(sra->sys_name);
 		if (bul) {
 			char buf[1024];
-			int l = readlink(bul, buf, sizeof(buf));
+			int l = readlink(bul, buf, sizeof(buf) - 1);
 			if (l > 0) {
 				buf[l]=0;
 				unlink(buf);