xen-netback: use RING_COPY_REQUEST() throughout

commit 68a33bfd upstream.

Instead of open-coding memcpy()s and directly accessing Tx and Rx
requests, use the new RING_COPY_REQUEST() that ensures the local copy
is correct.

This is more than is strictly necessary for guest Rx requests since
only the id and gref fields are used and it is harmless if the
frontend modifies these.

This is part of XSA155.
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

drivers/net/xen-netback/netback.c

@@ -313,17 +313,17 @@ static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif,
 						 struct netrx_pending_operations *npo)
 {
 	struct xenvif_rx_meta *meta;
-	struct xen_netif_rx_request *req;
+	struct xen_netif_rx_request req;
 
-	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
+	RING_COPY_REQUEST(&vif->rx, vif->rx.req_cons++, &req);
 
 	meta = npo->meta + npo->meta_prod++;
 	meta->gso_size = 0;
 	meta->size = 0;
-	meta->id = req->id;
+	meta->id = req.id;
 
 	npo->copy_off = 0;
-	npo->copy_gref = req->gref;
+	npo->copy_gref = req.gref;
 
 	return meta;
 }
@@ -424,7 +424,7 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 	struct xenvif *vif = netdev_priv(skb->dev);
 	int nr_frags = skb_shinfo(skb)->nr_frags;
 	int i;
-	struct xen_netif_rx_request *req;
+	struct xen_netif_rx_request req;
 	struct xenvif_rx_meta *meta;
 	unsigned char *data;
 	int head = 1;
@@ -434,14 +434,14 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 
 	/* Set up a GSO prefix descriptor, if necessary */
 	if (skb_shinfo(skb)->gso_size && vif->gso_prefix) {
-		req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
+		RING_COPY_REQUEST(&vif->rx, vif->rx.req_cons++, &req);
 		meta = npo->meta + npo->meta_prod++;
 		meta->gso_size = skb_shinfo(skb)->gso_size;
 		meta->size = 0;
-		meta->id = req->id;
+		meta->id = req.id;
 	}
 
-	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
+	RING_COPY_REQUEST(&vif->rx, vif->rx.req_cons++, &req);
 	meta = npo->meta + npo->meta_prod++;
 
 	if (!vif->gso_prefix)
@@ -450,9 +450,9 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 		meta->gso_size = 0;
 
 	meta->size = 0;
-	meta->id = req->id;
+	meta->id = req.id;
 	npo->copy_off = 0;
-	npo->copy_gref = req->gref;
+	npo->copy_gref = req.gref;
 
 	data = skb->data;
 	while (data < skb_tail_pointer(skb)) {
@@ -721,7 +721,7 @@ static void xenvif_tx_err(struct xenvif *vif,
 		make_tx_response(vif, txp, XEN_NETIF_RSP_ERROR);
 		if (cons == end)
 			break;
-		txp = RING_GET_REQUEST(&vif->tx, cons++);
+		RING_COPY_REQUEST(&vif->tx, cons++, txp);
 	} while (1);
 	vif->tx.req_cons = cons;
 }
@@ -786,8 +786,7 @@ static int xenvif_count_requests(struct xenvif *vif,
 		if (drop_err)
 			txp = &dropped_tx;
 
-		memcpy(txp, RING_GET_REQUEST(&vif->tx, cons + slots),
-		       sizeof(*txp));
+		RING_COPY_REQUEST(&vif->tx, cons + slots, txp);
 
 		/* If the guest submitted a frame >= 64 KiB then
 		 * first->size overflowed and following slots will
@@ -1073,8 +1072,7 @@ static int xenvif_get_extras(struct xenvif *vif,
 			return -EBADR;
 		}
 
-		memcpy(&extra, RING_GET_REQUEST(&vif->tx, cons),
-		       sizeof(extra));
+		RING_COPY_REQUEST(&vif->tx, cons, &extra);
 		if (unlikely(!extra.type ||
 			     extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
 			vif->tx.req_cons = ++cons;
@@ -1250,7 +1248,7 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif)
 
 		idx = vif->tx.req_cons;
 		rmb(); /* Ensure that we see the request before we copy it. */
-		memcpy(&txreq, RING_GET_REQUEST(&vif->tx, idx), sizeof(txreq));
+		RING_COPY_REQUEST(&vif->tx, idx, &txreq);
 
 		/* Credit-based scheduling. */
 		if (txreq.size > vif->remaining_credit &&