1 files changed, 16 insertions, 4 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index daecb009c05b..88de45491376 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -472,6 +472,7 @@ struct svc_procedure {
 	/* XDR free result: */
 	void			(*pc_release)(struct svc_rqst *);
 	unsigned int		pc_argsize;	/* argument struct size */
+	unsigned int		pc_argzero;	/* how much of argument to clear */
 	unsigned int		pc_ressize;	/* result struct size */
 	unsigned int		pc_cachetype;	/* cache info (NFS) */
 	unsigned int		pc_xdrressize;	/* maximum size of XDR reply */
@@ -544,16 +545,27 @@ static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
 }
 
 /**
- * svcxdr_init_decode - Prepare an xdr_stream for svc Call decoding
+ * svcxdr_init_decode - Prepare an xdr_stream for Call decoding
  * @rqstp: controlling server RPC transaction context
  *
+ * This function currently assumes the RPC header in rq_arg has
+ * already been decoded. Upon return, xdr->p points to the
+ * location of the upper layer header.
  */
 static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
 {
 	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
-	struct kvec *argv = rqstp->rq_arg.head;
+	struct xdr_buf *buf = &rqstp->rq_arg;
+	struct kvec *argv = buf->head;
 
-	xdr_init_decode(xdr, &rqstp->rq_arg, argv->iov_base, NULL);
+	/*
+	 * svc_getnl() and friends do not keep the xdr_buf's ::len
+	 * field up to date. Refresh that field before initializing
+	 * the argument decoding stream.
+	 */
+	buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len;
+
+	xdr_init_decode(xdr, buf, argv->iov_base, NULL);
 	xdr_set_scratch_page(xdr, rqstp->rq_scratch_page);
 }
 
@@ -576,7 +588,7 @@ static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
 	xdr->end = resv->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
 	buf->len = resv->iov_len;
 	xdr->page_ptr = buf->pages - 1;
-	buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages);
+	buf->buflen = PAGE_SIZE * (rqstp->rq_page_end - buf->pages);
 	buf->buflen -= rqstp->rq_auth_slack;
 	xdr->rqst = NULL;
 }