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    Subject[PATCH 5.3 045/105] fuse: verify nlink
    Date
    From: Miklos Szeredi <mszeredi@redhat.com>

    commit c634da718db9b2fac201df2ae1b1b095344ce5eb upstream.

    When adding a new hard link, make sure that i_nlink doesn't overflow.

    Fixes: ac45d61357e8 ("fuse: fix nlink after unlink")
    Cc: <stable@vger.kernel.org> # v3.4
    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/fuse/dir.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/fs/fuse/dir.c
    +++ b/fs/fuse/dir.c
    @@ -814,7 +814,8 @@ static int fuse_link(struct dentry *entr

    spin_lock(&fi->lock);
    fi->attr_version = atomic64_inc_return(&fc->attr_version);
    - inc_nlink(inode);
    + if (likely(inode->i_nlink < UINT_MAX))
    + inc_nlink(inode);
    spin_unlock(&fi->lock);
    fuse_invalidate_attr(inode);
    fuse_update_ctime(inode);

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