Re: [PATCH v13 47/51] nfs: Fix GETATTR bitmap verification

[Trond Myklebust]

On Tue, Nov 3, 2015 at 10:17 AM, Andreas Gruenbacher
<agruenba@xxxxxxxxxx> wrote:
> When decoding GETATTR replies, the client checks the attribute bitmap
> for which attributes the server has sent.  It misses bits at the word
> boundaries, though; fix that.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
> ---
>  fs/nfs/nfs4xdr.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>
> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
> index 788adf3..6f6d921 100644
> --- a/fs/nfs/nfs4xdr.c
> +++ b/fs/nfs/nfs4xdr.c
> @@ -4375,6 +4375,11 @@ static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
>                 goto xdr_error;
>         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
>                 goto xdr_error;
> +
> +       status = -EIO;
> +       if (unlikely(bitmap[0]))
> +               goto xdr_error;
> +
>         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
>                 goto xdr_error;
>         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
> @@ -4574,6 +4579,10 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
>                 goto xdr_error;
>         fattr->valid |= status;
>
> +       status = -EIO;
> +       if (unlikely(bitmap[0]))
> +               goto xdr_error;
> +
>         status = decode_attr_mode(xdr, bitmap, &fmode);
>         if (status < 0)
>                 goto xdr_error;
> @@ -4627,6 +4636,10 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
>                 goto xdr_error;
>         fattr->valid |= status;
>
> +       status = -EIO;
> +       if (unlikely(bitmap[1]))
> +               goto xdr_error;
> +
>         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
>         if (status < 0)
>                 goto xdr_error;
> @@ -4789,12 +4802,22 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
>         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
>                 goto xdr_error;
>         fsinfo->wtpref = fsinfo->wtmax;
> +
> +       status = -EIO;
> +       if (unlikely(bitmap[0]))
> +               goto xdr_error;
> +
>         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
>         if (status != 0)
>                 goto xdr_error;
>         status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
>         if (status != 0)
>                 goto xdr_error;
> +
> +       status = -EIO;
> +       if (unlikely(bitmap[1]))
> +               goto xdr_error;
> +
>         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
>         if (status)
>                 goto xdr_error;
> --
> 2.5.0

This patch can and should be merged separately from this patchset.
Please submit it through the usual channels.

Trond
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