From b1448450bf74c3e38b07c3bbb1785a52792c6a8d Mon Sep 17 00:00:00 2001
From: Keith Bostic <bostic@ucbvax.Berkeley.EDU>
Date: Thu, 16 Feb 1989 22:23:38 -0800
Subject: [PATCH 1/1] don't allow more than LINK_MAX links

SCCS-vsn: sys/kern/vfs_syscalls.c 7.5
SCCS-vsn: sys/ufs/ffs/ffs_vnops.c 7.5
SCCS-vsn: sys/ufs/ffs/ufs_vnops.c 7.5
SCCS-vsn: sys/ufs/lfs/lfs_vnops.c 7.5
SCCS-vsn: sys/ufs/ufs/ufs_vnops.c 7.5
---
 usr/src/sys/kern/vfs_syscalls.c | 7 ++++++-
 usr/src/sys/ufs/ffs/ffs_vnops.c | 7 ++++++-
 usr/src/sys/ufs/ffs/ufs_vnops.c | 7 ++++++-
 usr/src/sys/ufs/lfs/lfs_vnops.c | 7 ++++++-
 usr/src/sys/ufs/ufs/ufs_vnops.c | 7 ++++++-
 5 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/usr/src/sys/kern/vfs_syscalls.c b/usr/src/sys/kern/vfs_syscalls.c
index 7485eee2c9..1e507dedc1 100644
--- a/usr/src/sys/kern/vfs_syscalls.c
+++ b/usr/src/sys/kern/vfs_syscalls.c
@@ -3,7 +3,7 @@
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *
- *	@(#)vfs_syscalls.c	7.4 (Berkeley) %G%
+ *	@(#)vfs_syscalls.c	7.5 (Berkeley) %G%
  */
 
 #include "param.h"
@@ -264,6 +264,11 @@ link()
 		iput(ip);
 		return;
 	}
+	if (ip->i_nlink == LINK_MAX - 1) {
+		u.u_error = EMLINK;
+		iput(ip);
+		return;
+	}
 	ip->i_nlink++;
 	ip->i_flag |= ICHG;
 	iupdat(ip, &time, &time, 1);
diff --git a/usr/src/sys/ufs/ffs/ffs_vnops.c b/usr/src/sys/ufs/ffs/ffs_vnops.c
index 7566bc5a24..0b53693bf7 100644
--- a/usr/src/sys/ufs/ffs/ffs_vnops.c
+++ b/usr/src/sys/ufs/ffs/ffs_vnops.c
@@ -3,7 +3,7 @@
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *
- *	@(#)ffs_vnops.c	7.4 (Berkeley) %G%
+ *	@(#)ffs_vnops.c	7.5 (Berkeley) %G%
  */
 
 #include "param.h"
@@ -264,6 +264,11 @@ link()
 		iput(ip);
 		return;
 	}
+	if (ip->i_nlink == LINK_MAX - 1) {
+		u.u_error = EMLINK;
+		iput(ip);
+		return;
+	}
 	ip->i_nlink++;
 	ip->i_flag |= ICHG;
 	iupdat(ip, &time, &time, 1);
diff --git a/usr/src/sys/ufs/ffs/ufs_vnops.c b/usr/src/sys/ufs/ffs/ufs_vnops.c
index 016a175485..337aa7ffe1 100644
--- a/usr/src/sys/ufs/ffs/ufs_vnops.c
+++ b/usr/src/sys/ufs/ffs/ufs_vnops.c
@@ -3,7 +3,7 @@
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *
- *	@(#)ufs_vnops.c	7.4 (Berkeley) %G%
+ *	@(#)ufs_vnops.c	7.5 (Berkeley) %G%
  */
 
 #include "param.h"
@@ -264,6 +264,11 @@ link()
 		iput(ip);
 		return;
 	}
+	if (ip->i_nlink == LINK_MAX - 1) {
+		u.u_error = EMLINK;
+		iput(ip);
+		return;
+	}
 	ip->i_nlink++;
 	ip->i_flag |= ICHG;
 	iupdat(ip, &time, &time, 1);
diff --git a/usr/src/sys/ufs/lfs/lfs_vnops.c b/usr/src/sys/ufs/lfs/lfs_vnops.c
index bc4354f3ee..5cdd1e7e39 100644
--- a/usr/src/sys/ufs/lfs/lfs_vnops.c
+++ b/usr/src/sys/ufs/lfs/lfs_vnops.c
@@ -3,7 +3,7 @@
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *
- *	@(#)lfs_vnops.c	7.4 (Berkeley) %G%
+ *	@(#)lfs_vnops.c	7.5 (Berkeley) %G%
  */
 
 #include "param.h"
@@ -264,6 +264,11 @@ link()
 		iput(ip);
 		return;
 	}
+	if (ip->i_nlink == LINK_MAX - 1) {
+		u.u_error = EMLINK;
+		iput(ip);
+		return;
+	}
 	ip->i_nlink++;
 	ip->i_flag |= ICHG;
 	iupdat(ip, &time, &time, 1);
diff --git a/usr/src/sys/ufs/ufs/ufs_vnops.c b/usr/src/sys/ufs/ufs/ufs_vnops.c
index 016a175485..337aa7ffe1 100644
--- a/usr/src/sys/ufs/ufs/ufs_vnops.c
+++ b/usr/src/sys/ufs/ufs/ufs_vnops.c
@@ -3,7 +3,7 @@
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *
- *	@(#)ufs_vnops.c	7.4 (Berkeley) %G%
+ *	@(#)ufs_vnops.c	7.5 (Berkeley) %G%
  */
 
 #include "param.h"
@@ -264,6 +264,11 @@ link()
 		iput(ip);
 		return;
 	}
+	if (ip->i_nlink == LINK_MAX - 1) {
+		u.u_error = EMLINK;
+		iput(ip);
+		return;
+	}
 	ip->i_nlink++;
 	ip->i_flag |= ICHG;
 	iupdat(ip, &time, &time, 1);
-- 
2.20.1