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

[Al Viro]

Signed-off-by: Al Viro <v...@zeniv.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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