xen-netback: BUG_ON in xenvif_rx_action() not catching overflow

[cascardo/linux.git] / drivers / net / xen-netback / netback.c

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 573f3e8..cd0bd95 100644 (file)
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -482,6 +482,8 @@ static void xenvif_rx_action(struct xenvif *vif)
 
        while ((skb = skb_dequeue(&vif->rx_queue)) != NULL) {
                RING_IDX max_slots_needed;
+               RING_IDX old_req_cons;
+               RING_IDX ring_slots_used;
                int i;
 
                /* We need a cheap worse case estimate for the number of
@@ -530,8 +532,12 @@ static void xenvif_rx_action(struct xenvif *vif)
                        vif->rx_last_skb_slots = 0;
 
                sco = (struct skb_cb_overlay *)skb->cb;
+
+               old_req_cons = vif->rx.req_cons;
                sco->meta_slots_used = xenvif_gop_skb(skb, &npo);
-               BUG_ON(sco->meta_slots_used > max_slots_needed);
+               ring_slots_used = vif->rx.req_cons - old_req_cons;
+
+               BUG_ON(ring_slots_used > max_slots_needed);
 
                __skb_queue_tail(&rxq, skb);
        }