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    Subject[PATCH 003/106] nfsd4: fix decoding of compounds across page boundaries
    Date
    3.5.7.18 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: "J. Bruce Fields" <bfields@redhat.com>

    commit 247500820ebd02ad87525db5d9b199e5b66f6636 upstream.

    A freebsd NFSv4.0 client was getting rare IO errors expanding a tarball.
    A network trace showed the server returning BAD_XDR on the final getattr
    of a getattr+write+getattr compound. The final getattr started on a
    page boundary.

    I believe the Linux client ignores errors on the post-write getattr, and
    that that's why we haven't seen this before.

    Reported-by: Rick Macklem <rmacklem@uoguelph.ca>
    Signed-off-by: J. Bruce Fields <bfields@redhat.com>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    fs/nfsd/nfs4xdr.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
    index b2ae2da..65ed9bf 100644
    --- a/fs/nfsd/nfs4xdr.c
    +++ b/fs/nfsd/nfs4xdr.c
    @@ -161,8 +161,8 @@ static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
    */
    memcpy(p, argp->p, avail);
    /* step to next page */
    - argp->p = page_address(argp->pagelist[0]);
    argp->pagelist++;
    + argp->p = page_address(argp->pagelist[0]);
    if (argp->pagelen < PAGE_SIZE) {
    argp->end = argp->p + (argp->pagelen>>2);
    argp->pagelen = 0;
    --
    1.8.3.2


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