linux-kernel - [PATCH 2/2] btrfs: check link counter overflow in link(2)

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Message-ID: <20110304171518.GB26708@ZenIV.linux.org.uk>
Date:	Fri, 4 Mar 2011 17:15:18 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	chris.mason@...cle.com
Cc:	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: [PATCH 2/2] btrfs: check link counter overflow in link(2)


Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/btrfs/inode.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 099d64c..8a6df03 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4826,6 +4826,9 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 	if (root->objectid != BTRFS_I(inode)->root->objectid)
 		return -EPERM;
 
+	if (inode->i_nlink == ~0U)
+		return -EMLINK;
+
 	btrfs_inc_nlink(inode);
 	inode->i_ctime = CURRENT_TIME;
 
-- 
1.7.2.5

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