From: Benjamin Coddington <bcodding@redhat.com>
Date: Wed, 6 Apr 2016 15:32:52 +0000 (-0400)
Subject: SUNRPC: init xdr_stream for zero iov_len, page_len
X-Git-Tag: v4.14-rc1~3131^2~57
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=06ef26a0e35199cc0445d7d5708533a12af8ff5b;p=platform%2Fkernel%2Flinux-rpi.git

SUNRPC: init xdr_stream for zero iov_len, page_len

An xdr_buf with head[0].iov_len = 0 and page_len = 0 will cause
xdr_init_decode() to incorrectly setup the xdr_stream.  Specifically,
xdr->end is never initialized.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---

diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 6bdb386..c4f3cc0 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -797,6 +797,8 @@ void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
 		xdr_set_iov(xdr, buf->head, buf->len);
 	else if (buf->page_len != 0)
 		xdr_set_page_base(xdr, 0, buf->len);
+	else
+		xdr_set_iov(xdr, buf->head, buf->len);
 	if (p != NULL && p > xdr->p && xdr->end >= p) {
 		xdr->nwords -= p - xdr->p;
 		xdr->p = p;