[PATCH] nfsd4: fix discarded security labels on setattr

["J. Bruce Fields" <bfields@fieldses.org>]

Jeff just noticed this.  Argh.

--b.

commit 1012e867f57b3ae5712ea329065a9ab899c7986c
Author: J. Bruce Fields <bfields@redhat.com>
Date:   Fri Nov 1 10:42:15 2013 -0400

    nfsd4: fix discarded security labels on setattr
    
    Security labels in setattr calls are currently ignored because we forget
    to set label->len.
    
    Reported-by: Jeff Layton <jlayton@redhat.com>
    Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index d9454fe..438d818 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -411,6 +411,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 		if (!label->data)
 			return nfserr_jukebox;
+		label->len = dummy32;
 		defer_free(argp, kfree, label->data);
 		memcpy(label->data, buf, dummy32);
 	}