ext4: Limit number of links that can be created by ext4_link()

(cherry picked from commit b05ab1dc3795e6f997fb0d34f38fce5012533c3e)

In ext4_link we need to check using EXT4_LINK_MAX, and not
EXT4_DIR_LINK_MAX(), since ext4_link() is creating hard links of
regular files, and not directories.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 9d51ab9dd9da80af7ac7c165685aca9d403a9f84..06ce2d8859885c72bd7ecbadb84de11cc3750d26 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2310,7 +2310,7 @@ static int ext4_link(struct dentry *old_dentry,
        struct inode *inode = old_dentry->d_inode;
        int err, retries = 0;
 
-       if (EXT4_DIR_LINK_MAX(inode))
+       if (inode->i_nlink >= EXT4_LINK_MAX)
                return -EMLINK;
 
        /*