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    Subject[patch 38/39] Normal user can panic NFS client with direct I/O (CVE-2006-0555)
    -stable review patch.  If anyone has any objections, please let us know.
    ------------------

    This is CVE-2006-0555 and SGI bug 946529. A normal user can panic an
    NFS client and cause a local DoS with 'judicious'(?) use of O_DIRECT.

    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---

    fs/nfs/direct.c | 5 +++++
    1 files changed, 5 insertions(+)

    --- linux-2.6.15.4.orig/fs/nfs/direct.c
    +++ linux-2.6.15.4/fs/nfs/direct.c
    @@ -106,6 +106,11 @@ nfs_get_user_pages(int rw, unsigned long
    result = get_user_pages(current, current->mm, user_addr,
    page_count, (rw == READ), 0,
    *pages, NULL);
    + if (result >= 0 && result < page_count) {
    + nfs_free_user_pages(*pages, result, 0);
    + *pages = NULL;
    + result = -EFAULT;
    + }
    up_read(&current->mm->mmap_sem);
    }
    return result;
    --
    -
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